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wifi: mac80211: check defragmentation succeeded 

[ Upstream commit 98849ba2aa9db46e62720fb686a9d63ed9887806 ]

We need to check that cfg80211_defragment_element()
didn't return an error, since it can fail due to bad
input, and we didn't catch that before.

Fixes: 8eb8dd2ffb ("wifi: mac80211: Support link removal using Reconfiguration ML element")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20231211085121.8595a6b67fc0.I1225edd8f98355e007f96502e358e476c7971d8c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Berg 2023-12-11 09:05:30 +02:00 committed by Greg Kroah-Hartman
parent 35de90d7fa
commit 1ac3318338
1 changed files with 3 additions and 1 deletions
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4
net/mac80211/mlme.c
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@ -5805,7 +5805,7 @@ static void ieee80211_ml_reconfiguration(struct ieee80211_sub_if_data *sdata,
{
const struct ieee80211_multi_link_elem *ml;
const struct element *sub;
size_t ml_len;
ssize_t ml_len;
unsigned long removed_links = 0;
u16 link_removal_timeout[IEEE80211_MLD_MAX_NUM_LINKS] = {};
u8 link_id;
@ -5821,6 +5821,8 @@ static void ieee80211_ml_reconfiguration(struct ieee80211_sub_if_data *sdata,
elems->scratch + elems->scratch_len -
elems->scratch_pos,
WLAN_EID_FRAGMENT);
if (ml_len < 0)
return;
elems->ml_reconf = (const void *)elems->scratch_pos;
elems->ml_reconf_len = ml_len;