Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip It's possible that mtk_crtc->event is NULL in mtk_drm_crtc_finish_page_flip(). pending_needs_vblank value is set by mtk_crtc->event, but in mtk_drm_crtc_atomic_flush(), it's is not guarded by the same lock in mtk_drm_finish_page_flip(), thus a race condition happens. Consider the following case: CPU1 CPU2 step 1: mtk_drm_crtc_atomic_begin() mtk_crtc->event is not null, step 1: mtk_drm_crtc_atomic_flush: mtk_drm_crtc_update_config( !!mtk_crtc->event) step 2: mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip: lock mtk_crtc->event set to null, pending_needs_vblank set to false unlock pending_needs_vblank set to true, step 2: mtk_crtc_ddp_irq -> mtk_drm_finish_page_flip called again, pending_needs_vblank is still true //null pointer Instead of guarding the entire mtk_drm_crtc_atomic_flush(), it's more efficient to just check if mtk_crtc->event is null before use.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 119f5173628aa7a0c3cf9db83460d40709e8241d before accdac6b71d5a2b84040c3d2234f53a60edc398e; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before dfde84cc6c589f2a9f820f12426d97365670b731; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before 4688be96d20ffa49d2186523ee84f475f316fd49; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before 9beec711a17245b853d64488fd5b739031612340; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before d2bd30c710475b2e29288827d2c91f9e6e2b91d7; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before a3dd12b64ae8373a41a216a0b621df224210860a; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before 9acee29a38b4d4b70f1f583e5ef9a245db4db710; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before 3fc88b246a2fc16014e374040fc15af1d3752535; affected 119f5173628aa7a0c3cf9db83460d40709e8241d before c958e86e9cc1b48cac004a6e245154dfba8e163b |
| Linux / Linux | affected 4.7; unaffected 0 before 4.7; unaffected 4.19.311 through 4.19.*; unaffected 5.4.273 through 5.4.*; unaffected 5.10.214 through 5.10.*; unaffected 5.15.153 through 5.15.*; unaffected 6.1.83 through 6.1.*; unaffected 6.6.23 through 6.6.*; unaffected 6.7.11 through 6.7.*; unaffected 6.8.2 through 6.8.*; unaffected 6.9 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e
- https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731
- https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49
- https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340
- https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7
- https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a
- https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710
- https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535
- https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e
- https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731
- https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49
- https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340
- https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7
- https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a
- https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710
- https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535
- https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html