CVE-2022-49491: 
Linux Kernel vulnerability analysis and mitigation

CVE-2022-49491 is a vulnerability in the Linux kernel's Rockchip VOP (Video Output Processor) driver. The issue was discovered in the vopbind() function where a potential null pointer dereference could occur when platformgetresource() returns NULL. The vulnerability was fixed by moving the resourcesize() call after devmioremapresource() which includes proper NULL checking (Kernel Commit).

The vulnerability exists in the drivers/gpu/drm/rockchip/rockchipdrmvop.c file. The issue occurs when resourcesize() is called on a potentially NULL pointer returned by platformgetresource(). The fix involves reordering operations to ensure proper NULL checking is performed by devmioremap_resource() before accessing the resource size. This vulnerability fixes a bug introduced in commit 2048e3286f34 ("drm: rockchip: Add basic drm driver") (Kernel Commit).

If exploited, this vulnerability could lead to a null pointer dereference in the kernel, potentially causing a system crash or denial of service condition (NVD Results).

The vulnerability has been patched in the Linux kernel. The fix involves moving the resourcesize() call after the devmioremap_resource() function call, which properly validates the resource pointer before use (Kernel Commit).