mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 13:53:33 +00:00
Code Issues Releases Wiki Activity

wifi: cfg80211: fix buffer overflow in elem comparison

Browse source 
[ Upstream commit 9f16b5c82a ]

For vendor elements, the code here assumes that 5 octets
are present without checking. Since the element itself is
already checked to fit, we only need to check the length.

Reported-and-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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Johannes Berg 2022-11-25 12:36:57 +01:00 committed by Greg Kroah-Hartman
parent 34cbc950d0
commit 391cb87255
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
net/wireless/scan.c
View file

@ -330,7 +330,8 @@ static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
* determine if they are the same ie.
*/
if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
if (tmp_old[1] >= 5 && tmp[1] >= 5 &&
!memcmp(tmp_old + 2, tmp + 2, 5)) {
/* same vendor ie, copy from
* subelement
*/