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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
nl80211: improve nl80211_parse_mesh_config type checking
When building a kernel with W=1, the nl80211.c file causes a number of warnings, all about the same problem: net/wireless/nl80211.c: In function 'nl80211_parse_mesh_config': net/wireless/nl80211.c:5287:103: error: comparison is always false due to limited range of data type [-Werror=type-limits] net/wireless/nl80211.c:5290:96: error: comparison is always false due to limited range of data type [-Werror=type-limits] net/wireless/nl80211.c:5293:124: error: comparison is always false due to limited range of data type [-Werror=type-limits] net/wireless/nl80211.c:5295:148: error: comparison is always false due to limited range of data type [-Werror=type-limits] net/wireless/nl80211.c:5298:106: error: comparison is always false due to limited range of data type [-Werror=type-limits] net/wireless/nl80211.c:5305:116: error: comparison is always false due to limited range of data type [-Werror=type-limits] The problem is that gcc does not notice that the check is generate by a macro, so it complains about comparing an unsigned type against 0. I've tried to come up with a way to rephrase that code in a way that avoids the warnings and otherwise improves the code as well. This uses a set of new helper functions that perform the range checking, and should provide slightly better type safety than the older patch, at the expense of adding 44 lines to the code. Binary code size is basically unchanged though (20 bytes added to 126561 bytes .text). Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
This commit is contained in:
parent
f21e4d8ed1
commit
f151d9db4c
1 changed files with 74 additions and 30 deletions
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@ -5287,6 +5287,51 @@ static const struct nla_policy
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[NL80211_MESH_SETUP_USERSPACE_AMPE] = { .type = NLA_FLAG },
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};
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static int nl80211_check_bool(const struct nlattr *nla, u8 min, u8 max, bool *out)
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{
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u8 val = nla_get_u8(nla);
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if (val < min || val > max)
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return -EINVAL;
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*out = val;
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return 0;
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}
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static int nl80211_check_u8(const struct nlattr *nla, u8 min, u8 max, u8 *out)
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{
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u8 val = nla_get_u8(nla);
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if (val < min || val > max)
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return -EINVAL;
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*out = val;
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return 0;
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}
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static int nl80211_check_u16(const struct nlattr *nla, u16 min, u16 max, u16 *out)
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{
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u16 val = nla_get_u16(nla);
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if (val < min || val > max)
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return -EINVAL;
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*out = val;
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return 0;
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}
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static int nl80211_check_u32(const struct nlattr *nla, u32 min, u32 max, u32 *out)
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{
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u32 val = nla_get_u32(nla);
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if (val < min || val > max)
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return -EINVAL;
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*out = val;
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return 0;
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}
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static int nl80211_check_s32(const struct nlattr *nla, s32 min, s32 max, s32 *out)
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{
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s32 val = nla_get_s32(nla);
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if (val < min || val > max)
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return -EINVAL;
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*out = val;
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return 0;
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}
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static int nl80211_parse_mesh_config(struct genl_info *info,
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struct mesh_config *cfg,
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u32 *mask_out)
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@ -5297,9 +5342,8 @@ static int nl80211_parse_mesh_config(struct genl_info *info,
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#define FILL_IN_MESH_PARAM_IF_SET(tb, cfg, param, min, max, mask, attr, fn) \
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do { \
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if (tb[attr]) { \
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if (fn(tb[attr]) < min || fn(tb[attr]) > max) \
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if (fn(tb[attr], min, max, &cfg->param)) \
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return -EINVAL; \
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cfg->param = fn(tb[attr]); \
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mask |= (1 << (attr - 1)); \
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} \
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} while (0)
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@ -5318,99 +5362,99 @@ do { \
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/* Fill in the params struct */
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshRetryTimeout, 1, 255,
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mask, NL80211_MESHCONF_RETRY_TIMEOUT,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshConfirmTimeout, 1, 255,
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mask, NL80211_MESHCONF_CONFIRM_TIMEOUT,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHoldingTimeout, 1, 255,
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mask, NL80211_MESHCONF_HOLDING_TIMEOUT,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshMaxPeerLinks, 0, 255,
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mask, NL80211_MESHCONF_MAX_PEER_LINKS,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshMaxRetries, 0, 16,
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mask, NL80211_MESHCONF_MAX_RETRIES,
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nla_get_u8);
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nl80211_check_u8);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshTTL, 1, 255,
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mask, NL80211_MESHCONF_TTL, nla_get_u8);
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mask, NL80211_MESHCONF_TTL, nl80211_check_u8);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, element_ttl, 1, 255,
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mask, NL80211_MESHCONF_ELEMENT_TTL,
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nla_get_u8);
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nl80211_check_u8);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, auto_open_plinks, 0, 1,
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mask, NL80211_MESHCONF_AUTO_OPEN_PLINKS,
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nla_get_u8);
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nl80211_check_bool);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshNbrOffsetMaxNeighbor,
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1, 255, mask,
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NL80211_MESHCONF_SYNC_OFFSET_MAX_NEIGHBOR,
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nla_get_u32);
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nl80211_check_u32);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPmaxPREQretries, 0, 255,
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mask, NL80211_MESHCONF_HWMP_MAX_PREQ_RETRIES,
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nla_get_u8);
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nl80211_check_u8);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, path_refresh_time, 1, 65535,
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mask, NL80211_MESHCONF_PATH_REFRESH_TIME,
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nla_get_u32);
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nl80211_check_u32);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, min_discovery_timeout, 1, 65535,
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mask, NL80211_MESHCONF_MIN_DISCOVERY_TIMEOUT,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPactivePathTimeout,
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1, 65535, mask,
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NL80211_MESHCONF_HWMP_ACTIVE_PATH_TIMEOUT,
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nla_get_u32);
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nl80211_check_u32);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPpreqMinInterval,
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1, 65535, mask,
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NL80211_MESHCONF_HWMP_PREQ_MIN_INTERVAL,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPperrMinInterval,
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1, 65535, mask,
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NL80211_MESHCONF_HWMP_PERR_MIN_INTERVAL,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
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dot11MeshHWMPnetDiameterTraversalTime,
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1, 65535, mask,
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NL80211_MESHCONF_HWMP_NET_DIAM_TRVS_TIME,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPRootMode, 0, 4,
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mask, NL80211_MESHCONF_HWMP_ROOTMODE,
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nla_get_u8);
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nl80211_check_u8);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPRannInterval, 1, 65535,
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mask, NL80211_MESHCONF_HWMP_RANN_INTERVAL,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
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dot11MeshGateAnnouncementProtocol, 0, 1,
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mask, NL80211_MESHCONF_GATE_ANNOUNCEMENTS,
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nla_get_u8);
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nl80211_check_bool);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshForwarding, 0, 1,
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mask, NL80211_MESHCONF_FORWARDING,
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nla_get_u8);
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nl80211_check_bool);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, rssi_threshold, -255, 0,
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mask, NL80211_MESHCONF_RSSI_THRESHOLD,
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nla_get_s32);
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nl80211_check_s32);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, ht_opmode, 0, 16,
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mask, NL80211_MESHCONF_HT_OPMODE,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMPactivePathToRootTimeout,
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1, 65535, mask,
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NL80211_MESHCONF_HWMP_PATH_TO_ROOT_TIMEOUT,
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nla_get_u32);
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nl80211_check_u32);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshHWMProotInterval, 1, 65535,
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mask, NL80211_MESHCONF_HWMP_ROOT_INTERVAL,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg,
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dot11MeshHWMPconfirmationInterval,
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1, 65535, mask,
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NL80211_MESHCONF_HWMP_CONFIRMATION_INTERVAL,
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nla_get_u16);
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nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, power_mode,
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NL80211_MESH_POWER_ACTIVE,
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NL80211_MESH_POWER_MAX,
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mask, NL80211_MESHCONF_POWER_MODE,
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nla_get_u32);
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nl80211_check_u32);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, dot11MeshAwakeWindowDuration,
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0, 65535, mask,
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NL80211_MESHCONF_AWAKE_WINDOW, nla_get_u16);
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NL80211_MESHCONF_AWAKE_WINDOW, nl80211_check_u16);
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FILL_IN_MESH_PARAM_IF_SET(tb, cfg, plink_timeout, 0, 0xffffffff,
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mask, NL80211_MESHCONF_PLINK_TIMEOUT,
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nla_get_u32);
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nl80211_check_u32);
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if (mask_out)
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*mask_out = mask;
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