Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-21 19:41:42 +00:00
Code Issues Packages Projects Releases Wiki Activity

wifi: cfg80211: correct S1G beacon length calculation

Browse Source 
The minimum header length calculation (equivalent to the start
of the elements) for the S1G long beacon erroneously required
only up to the start of u.s1g_beacon rather than the start of
u.s1g_beacon.variable. Fix that, and also shuffle the branches
around a bit to not assign useless values that are overwritten
later.

Reported-by: syzbot+0f3afa93b91202f21939@syzkaller.appspotmail.com
Fixes: 9eaffe5078 ("cfg80211: convert S1G beacon to scan results")
Link: https://patch.msgid.link/20240724132912.9662972db7c1.I8779675b5bbda4994cc66f876b6b87a2361c3c0b@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2024-07-24 13:29:12 +02:00
parent baeaabf970
commit 6873cc4416
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
net/wireless/scan.c
View File

@ -3178,8 +3178,7 @@ cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
struct ieee80211_mgmt *mgmt, size_t len,
gfp_t gfp)
{
size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
size_t min_hdr_len;
struct ieee80211_ext *ext = NULL;
enum cfg80211_bss_frame_type ftype;
u16 beacon_interval;
@ -3202,10 +3201,16 @@ cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
ext = (void *) mgmt;
min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
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.variable);
} else {
/* same for beacons */
min_hdr_len = offsetof(struct ieee80211_mgmt,
u.probe_resp.variable);
}
if (WARN_ON(len < min_hdr_len))