From: Johannes Berg johannes.berg@intel.com
stable inclusion from stable-v4.19.222 commit 69f054d6642c8f6173724ce17e7ee3ff66b8f682 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SH2 CVE: CVE-2021-47602
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit d5e568c3a4ec2ddd23e7dc5ad5b0c64e4f22981a ]
For admission control, obviously all of that only works for QoS data frames, otherwise we cannot even access the QoS field in the header.
Syzbot reported (see below) an uninitialized value here due to a status of a non-QoS nullfunc packet, which isn't even long enough to contain the QoS header.
Fix this to only do anything for QoS data packets.
Reported-by: syzbot+614e82b88a1a4973e534@syzkaller.appspotmail.com Fixes: 02219b3abca5 ("mac80211: add WMM admission control support") Link: https://lore.kernel.org/r/20211122124737.dad29e65902a.Ieb04587afacb27c14e0de... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Dong Chenchen dongchenchen2@huawei.com --- net/mac80211/mlme.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index b0667467337d..373bdc1d035b 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -2346,11 +2346,18 @@ static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata, u16 tx_time) { struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; - u16 tid = ieee80211_get_tid(hdr); - int ac = ieee80211_ac_from_tid(tid); - struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac]; + u16 tid; + int ac; + struct ieee80211_sta_tx_tspec *tx_tspec; unsigned long now = jiffies;
+ if (!ieee80211_is_data_qos(hdr->frame_control)) + return; + + tid = ieee80211_get_tid(hdr); + ac = ieee80211_ac_from_tid(tid); + tx_tspec = &ifmgd->tx_tspec[ac]; + if (likely(!tx_tspec->admitted_time)) return;