CVE-2024-26874: drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip
First published: Wed Apr 17 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
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Reference Links
- https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535
- https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49
- https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710
- https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340
- https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a
- https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e
- https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b
- https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7
- https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731
- https://launchpad.net/bugs/cve/CVE-2024-26874
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26874
- https://nvd.nist.gov/vuln/detail/CVE-2024-26874
- https://security-tracker.debian.org/tracker/CVE-2024-26874
- https://ubuntu.com/security/CVE-2024-26874
- https://git.kernel.org/linus/c958e86e9cc1b48cac004a6e245154dfba8e163b
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