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mac80211: fix skb length check in ieee80211_scan_rx()

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Replace hard-coded compile-time constants for header length check
with dynamic determination based on the frame type. Otherwise, we
hit a validation WARN_ON in cfg80211 later.

Fixes: cd418ba63f ("mac80211: convert S1G beacon to scan results")
Reported-by: syzbot+405843667e93b9790fc1@syzkaller.appspotmail.com
Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210510041649.589754-1-ducheng2@gmail.com
[style fixes, reword commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Du Cheng 2021-05-10 12:16:49 +08:00 committed by Johannes Berg
parent b90f51e8e1
commit e298aa358f
1 changed files with 16 additions and 5 deletions
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21
net/mac80211/scan.c
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@ -251,13 +251,24 @@ void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
struct ieee80211_mgmt *mgmt = (void *)skb->data;
struct ieee80211_bss *bss;
struct ieee80211_channel *channel;
size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
if (!ieee80211_is_probe_resp(mgmt->frame_control) &&
!ieee80211_is_beacon(mgmt->frame_control) &&
!ieee80211_is_s1g_beacon(mgmt->frame_control))
return;
if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
if (skb->len < 15)
return;
} else if (skb->len < 24 ||
(!ieee80211_is_probe_resp(mgmt->frame_control) &&
!ieee80211_is_beacon(mgmt->frame_control)))
if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
min_hdr_len = offsetof(struct ieee80211_ext,
u.s1g_short_beacon.variable);
else
min_hdr_len = offsetof(struct ieee80211_ext,
u.s1g_beacon);
}
if (skb->len < min_hdr_len)
return;
sdata1 = rcu_dereference(local->scan_sdata);