| From bippy-7c5fe7eed585 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47502: ASoC: codecs: wcd934x: handle channel mappping list correctly |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ASoC: codecs: wcd934x: handle channel mappping list correctly |
| |
| Currently each channel is added as list to dai channel list, however |
| there is danger of adding same channel to multiple dai channel list |
| which endups corrupting the other list where its already added. |
| |
| This patch ensures that the channel is actually free before adding to |
| the dai channel list and also ensures that the channel is on the list |
| before deleting it. |
| |
| This check was missing previously, and we did not hit this issue as |
| we were testing very simple usecases with sequence of amixer commands. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47502 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit dd9eb19b567303e4b92747dcfb5deedb182af111 and fixed in 5.10.85 with commit 1089dac26c6b4b833323ae6c0ceab29fb30ede72 |
| Issue introduced in 5.6 with commit dd9eb19b567303e4b92747dcfb5deedb182af111 and fixed in 5.15.8 with commit 339ffb5b56005582aacc860524d2d208604049d1 |
| Issue introduced in 5.6 with commit dd9eb19b567303e4b92747dcfb5deedb182af111 and fixed in 5.16 with commit 23ba28616d3063bd4c4953598ed5e439ca891101 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47502 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| sound/soc/codecs/wcd934x.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/1089dac26c6b4b833323ae6c0ceab29fb30ede72 |
| https://git.kernel.org/stable/c/339ffb5b56005582aacc860524d2d208604049d1 |
| https://git.kernel.org/stable/c/23ba28616d3063bd4c4953598ed5e439ca891101 |
