lisa/android_kernel_xiaomi_sm8350
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

UPSTREAM: wifi: cfg80211: avoid nontransmitted BSS list corruption

Browse Source 
commit bcca852027e5878aec911a347407ecc88d6fff7f upstream.

If a non-transmitted BSS shares enough information (both
SSID and BSSID!) with another non-transmitted BSS of a
different AP, then we can find and update it, and then
try to add it to the non-transmitted BSS list. We do a
search for it on the transmitted BSS, but if it's not
there (but belongs to another transmitted BSS), the list
gets corrupted.

Since this is an erroneous situation, simply fail the
list insertion in this case and free the non-transmitted
BSS.

This fixes CVE-2022-42721.

Bug: 253642088
Reported-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de>
Tested-by: Sönke Huster <shuster@seemoo.tu-darmstadt.de>
Fixes: 0b8fb8235b ("cfg80211: Parsing of Multiple BSSID information in scanning")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: If733c3364cdca1ae7f33b2c07d8f872ad2ec5939
This commit is contained in:
Johannes Berg 2022-10-01 00:01:44 +02:00 committed by Treehugger Robot
parent 99f0812889
commit a30ebebb22
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
net/wireless/scan.c
View File

@ -390,6 +390,15 @@ cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
rcu_read_unlock(); rcu_read_unlock();
/*
* This is a bit weird - it's not on the list, but already on another
* one! The only way that could happen is if there's some BSSID/SSID
* shared by multiple APs in their multi-BSSID profiles, potentially
* with hidden SSID mixed in ... ignore it.
*/
if (!list_empty(&nontrans_bss->nontrans_list))
return -EINVAL;
/* add to the list */ /* add to the list */
list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list); list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
return 0; return 0;