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mac80211: fix potential null pointer dereference

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he_op is being dereferenced before it is null checked, hence there
is a potential null pointer dereference.

Fix this by moving the pointer dereference after he_op has been
properly null checked.

Notice that, currently, he_op is already being null checked before
calling this function at 4593:

4593	if (!he_oper ||
4594	    !ieee80211_verify_sta_he_mcs_support(sband, he_oper))
4595		ifmgd->flags |= IEEE80211_STA_DISABLE_HE;

but in case ieee80211_verify_sta_he_mcs_support is ever called
without verifying he_oper is not null, we will end up having a
null pointer dereference. So, we better don't take any chances.

Addresses-Coverity-ID: 1470068 ("Dereference before null check")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Gustavo A. R. Silva 2018-06-18 07:41:34 -05:00 committed by Johannes Berg
parent fe0984d389
commit 47aa7861b9
1 changed files with 3 additions and 1 deletions
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4
net/mac80211/mlme.c
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@ -4458,12 +4458,14 @@ ieee80211_verify_sta_he_mcs_support(struct ieee80211_supported_band *sband,
{
const struct ieee80211_sta_he_cap *sta_he_cap =
ieee80211_get_he_sta_cap(sband);
u16 ap_min_req_set = le16_to_cpu(he_op->he_mcs_nss_set);
u16 ap_min_req_set;
int i;
if (!sta_he_cap || !he_op)
return false;
ap_min_req_set = le16_to_cpu(he_op->he_mcs_nss_set);
/* Need to go over for 80MHz, 160MHz and for 80+80 */
for (i = 0; i < 3; i++) {
const struct ieee80211_he_mcs_nss_supp *sta_mcs_nss_supp =