Bugzilla – Bug 1220694
VUL-0: CVE-2021-46969: kernel: bus: mhi: core: Fix invalid error returning in mhi_queue
Last modified: 2024-04-29 07:08:53 UTC
In the Linux kernel, the following vulnerability has been resolved: bus: mhi: core: Fix invalid error returning in mhi_queue mhi_queue returns an error when the doorbell is not accessible in the current state. This can happen when the device is in non M0 state, like M3, and needs to be waken-up prior ringing the DB. This case is managed earlier by triggering an asynchronous M3 exit via controller resume/suspend callbacks, that in turn will cause M0 transition and DB update. So, since it's not an error but just delaying of doorbell update, there is no reason to return an error. This also fixes a use after free error for skb case, indeed a caller queuing skb will try to free the skb if the queueing fails, but in that case queueing has been done. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-46969 https://www.cve.org/CVERecord?id=CVE-2021-46969 https://bugzilla.redhat.com/show_bug.cgi?id=2266798 https://lore.kernel.org/linux-cve-announce/2024022720-CVE-2021-46969-3263@gregkh/T/#u Patch: https://git.kernel.org/stable/c/0ecc1c70dcd32c0f081b173a1a5d89952686f271
Closing since: -codestreams below cve/linux-5.3 are not affected -cve/linux-5.14,stable and SLE15-SP6 have already the patch