drm/exynos: exynos7_drm_decon: add vblank check in IRQ handling
Description
In the Linux kernel, the following vulnerability has been resolved:
drm/exynos: exynos7_drm_decon: add vblank check in IRQ handling
If there's support for another console device (such as a TTY serial), the kernel occasionally panics during boot. The panic message and a relevant snippet of the call stack is as follows:
Unable to handle kernel NULL pointer dereference at virtual address 000000000000000 Call trace: drm_crtc_handle_vblank+0x10/0x30 (P) decon_irq_handler+0x88/0xb4 [...]
Otherwise, the panics don't happen. This indicates that it's some sort of race condition.
Add a check to validate if the drm device can handle vblanks before calling drm_crtc_handle_vblank() to avoid this.
Affected products
2- Linux/Linuxv5Range: 4.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
8- git.kernel.org/stable/c/391e5ea5b877230b844c9bd8bbcd91b681b1ce2dmitre
- git.kernel.org/stable/c/87825fbd1e176cd5b896940f3959e7c9a916945dmitre
- git.kernel.org/stable/c/996740652e620ef8ee1e5c65832cf2ffa498577dmitre
- git.kernel.org/stable/c/a2130463fc9451005660b0eda7b61d5f746f7d74mitre
- git.kernel.org/stable/c/a40a35166f7e4f6dcd4b087d620c8228922dcb0amitre
- git.kernel.org/stable/c/b4e72c0bf878f02faa00a7dc7c9ffc4ff7c116a7mitre
- git.kernel.org/stable/c/b846350aa272de99bf6fecfa6b08e64ebfb13173mitre
- git.kernel.org/stable/c/e9d9b25f376737b81f06de9c5aa422b488f47184mitre
News mentions
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