Description
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix NULL pointer dereference in dcn401_init_hw() dcn401_init_hw() assumes that update_bw_bounding_box() is valid when entering the update path. However, the existing condition: ((!fams2_enable && update_bw_bounding_box) || freq_changed) does not guarantee this, as the freq_changed branch can evaluate to true independently of the callback pointer. This can result in calling update_bw_bounding_box() when it is NULL. Fix this by separating the update condition from the pointer checks and ensuring the callback, dc->clk_mgr, and bw_params are validated before use. Fixes the below: ../dc/hwss/dcn401/dcn401_hwseq.c:367 dcn401_init_hw() error: we previously assumed 'dc->res_pool->funcs->update_bw_bounding_box' could be null (see line 362) (cherry picked from commit 86117c5ab42f21562fedb0a64bffea3ee5fcd477)
Product status
ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 (git) before 10c13c111d0d7f8e101c742feff264fc98e3f9f7
ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 (git) before 2d4a6f0702c5211e0be8b688c5fc24f082ec74d6
ca0fb243c3bb53dbbd71d16c76f319bf923ee3d4 (git) before e927b36ae18b66b49219eaa9f46edc7b4fdbb25e
e13689793b9c0e7b5749954e77f5f85e68fe7138 (git)
6.12
Any version before 6.12
6.18.22 (semver)
6.19.12 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/10c13c111d0d7f8e101c742feff264fc98e3f9f7
git.kernel.org/...c/2d4a6f0702c5211e0be8b688c5fc24f082ec74d6
git.kernel.org/...c/e927b36ae18b66b49219eaa9f46edc7b4fdbb25e