From bippy-d175d3acf727 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman To: Reply-to: , Subject: CVE-2023-52773: drm/amd/display: fix a NULL pointer dereference in amdgpu_dm_i2c_xfer() Description =========== In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix a NULL pointer dereference in amdgpu_dm_i2c_xfer() When ddc_service_construct() is called, it explicitly checks both the link type and whether there is something on the link which will dictate whether the pin is marked as hw_supported. If the pin isn't set or the link is not set (such as from unloading/reloading amdgpu in an IGT test) then fail the amdgpu_dm_i2c_xfer() call. The Linux kernel CVE team has assigned CVE-2023-52773 to this issue. Affected and fixed versions =========================== Issue introduced in 6.0 with commit 22676bc500c2 and fixed in 6.1.64 with commit fb5c134ca589 Issue introduced in 6.0 with commit 22676bc500c2 and fixed in 6.5.13 with commit 5b14cf37b9f0 Issue introduced in 6.0 with commit 22676bc500c2 and fixed in 6.6.3 with commit 1d07b7e84276 Issue introduced in 6.0 with commit 22676bc500c2 and fixed in 6.7 with commit b71f4ade1b89 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-2023-52773 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: drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.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/fb5c134ca589fe670430acc9e7ebf2691ca2476d https://git.kernel.org/stable/c/5b14cf37b9f01de0b28c6f8960019d4c7883ce42 https://git.kernel.org/stable/c/1d07b7e84276777dad3c8cfebdf8e739606f90c9 https://git.kernel.org/stable/c/b71f4ade1b8900d30c661d6c27f87c35214c398c