Description
In the Linux kernel, the following vulnerability has been resolved: drm: bridge: dw_hdmi: fix connector access for scdc Commit 5d844091f237 ("drm/scdc-helper: Pimp SCDC debugs") changed the scdc interface to pick up an i2c adapter from a connector instead. However, in the case of dw-hdmi, the wrong connector was being used to pass i2c adapter information, since dw-hdmi's embedded connector structure is only populated when the bridge attachment callback explicitly asks for it. drm-meson is handling connector creation, so this won't happen, leading to a NULL pointer dereference. Fix it by having scdc functions access dw-hdmi's current connector pointer instead, which is assigned during the bridge enablement stage. [narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]
Product status
5d844091f2370f01752c3129b147861b9dcd3d98 (git) before 552f79aa9e801ed4f74d6b3221af78042ba4f235
5d844091f2370f01752c3129b147861b9dcd3d98 (git) before 98703e4e061fb8715c7613cd227e32cdfd136b23
6.4
Any version before 6.4
6.4.5 (semver)
6.5 (original_commit_for_fix)
References
git.kernel.org/...c/552f79aa9e801ed4f74d6b3221af78042ba4f235
git.kernel.org/...c/98703e4e061fb8715c7613cd227e32cdfd136b23
