cve-2024-26874
Vulnerability from cvelistv5
Published
2024-04-17 10:27
Modified
2024-11-05 09:17
Severity ?
Summary
drm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3fc88b246a2fc16014e374040fc15af1d3752535
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4688be96d20ffa49d2186523ee84f475f316fd49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9acee29a38b4d4b70f1f583e5ef9a245db4db710
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9beec711a17245b853d64488fd5b739031612340
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a3dd12b64ae8373a41a216a0b621df224210860a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/accdac6b71d5a2b84040c3d2234f53a60edc398e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c958e86e9cc1b48cac004a6e245154dfba8e163b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2bd30c710475b2e29288827d2c91f9e6e2b91d7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dfde84cc6c589f2a9f820f12426d97365670b731
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: Fix a null pointer crash in mtk_drm_crtc_finish_page_flip\n\nIt\u0027s possible that mtk_crtc-\u003eevent is NULL in\nmtk_drm_crtc_finish_page_flip().\n\npending_needs_vblank value is set by mtk_crtc-\u003eevent, but in\nmtk_drm_crtc_atomic_flush(), it\u0027s is not guarded by the same\nlock in mtk_drm_finish_page_flip(), thus a race condition happens.\n\nConsider the following case:\n\nCPU1                              CPU2\nstep 1:\nmtk_drm_crtc_atomic_begin()\nmtk_crtc-\u003eevent is not null,\n                                  step 1:\n                                  mtk_drm_crtc_atomic_flush:\n                                  mtk_drm_crtc_update_config(\n                                      !!mtk_crtc-\u003eevent)\nstep 2:\nmtk_crtc_ddp_irq -\u003e\nmtk_drm_finish_page_flip:\nlock\nmtk_crtc-\u003eevent set to null,\npending_needs_vblank set to false\nunlock\n                                  pending_needs_vblank set to true,\n\n                                  step 2:\n                                  mtk_crtc_ddp_irq -\u003e\n                                  mtk_drm_finish_page_flip called again,\n                                  pending_needs_vblank is still true\n                                  //null pointer\n\nInstead of guarding the entire mtk_drm_crtc_atomic_flush(), it\u0027s more\nefficient to just check if mtk_crtc-\u003eevent is null before use."
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  }
}


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