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netfilter: nft_compat: put back match/target module if init fail 

If the user specify the invalid NFTA_MATCH_INFO/NFTA_TARGET_INFO attr
or memory alloc fail, we should call module_put to the related match
or target. Otherwise, we cannot remove the module even nobody use it.

Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2016-07-23 16:00:31 +08:00 committed by Pablo Neira Ayuso
parent 96d1327ac2
commit 2bf4fade54
1 changed files with 24 additions and 8 deletions
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32
net/netfilter/nft_compat.c
View File

@ -634,6 +634,7 @@ nft_match_select_ops(const struct nft_ctx *ctx,
struct xt_match *match;
char *mt_name;
u32 rev, family;
int err;
if (tb[NFTA_MATCH_NAME] == NULL ||
tb[NFTA_MATCH_REV] == NULL ||
@ -660,13 +661,17 @@ nft_match_select_ops(const struct nft_ctx *ctx,
if (IS_ERR(match))
return ERR_PTR(-ENOENT);
if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO]))
return ERR_PTR(-EINVAL);
if (match->matchsize > nla_len(tb[NFTA_MATCH_INFO])) {
err = -EINVAL;
goto err;
}
/* This is the first time we use this match, allocate operations */
nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
if (nft_match == NULL)
return ERR_PTR(-ENOMEM);
if (nft_match == NULL) {
err = -ENOMEM;
goto err;
}
nft_match->ops.type = &nft_match_type;
nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize));
@ -680,6 +685,9 @@ nft_match_select_ops(const struct nft_ctx *ctx,
list_add(&nft_match->head, &nft_match_list);
return &nft_match->ops;
err:
module_put(match->me);
return ERR_PTR(err);
}
static void nft_match_release(void)
@ -717,6 +725,7 @@ nft_target_select_ops(const struct nft_ctx *ctx,
struct xt_target *target;
char *tg_name;
u32 rev, family;
int err;
if (tb[NFTA_TARGET_NAME] == NULL ||
tb[NFTA_TARGET_REV] == NULL ||
@ -743,13 +752,17 @@ nft_target_select_ops(const struct nft_ctx *ctx,
if (IS_ERR(target))
return ERR_PTR(-ENOENT);
if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO]))
return ERR_PTR(-EINVAL);
if (target->targetsize > nla_len(tb[NFTA_TARGET_INFO])) {
err = -EINVAL;
goto err;
}
/* This is the first time we use this target, allocate operations */
nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
if (nft_target == NULL)
return ERR_PTR(-ENOMEM);
if (nft_target == NULL) {
err = -ENOMEM;
goto err;
}
nft_target->ops.type = &nft_target_type;
nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize));
@ -767,6 +780,9 @@ nft_target_select_ops(const struct nft_ctx *ctx,
list_add(&nft_target->head, &nft_target_list);
return &nft_target->ops;
err:
module_put(target->me);
return ERR_PTR(err);
}
static void nft_target_release(void)