CVE-2021-47602 Information

Description

In the Linux kernel the following vulnerability has been resolved:

mac80211: track only QoS data frames for admission control

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.

Reference

https://git.kernel.org/stable/c/69f054d6642c8f6173724ce17e7ee3ff66b8f682 https://git.kernel.org/stable/c/46b9e29db2012a4d2a40a26101862e002ccf387b https://git.kernel.org/stable/c/eed897a22230e3231a740eddd7d6d95ba476625f https://git.kernel.org/stable/c/42d08e97b196479f593499e887a9ab81446a34b9 https://git.kernel.org/stable/c/d5e568c3a4ec2ddd23e7dc5ad5b0c64e4f22981a