In the Linux kernel, the following vulnerability has been resolved:
media: cedrus: skip invalid H.264 reference list entries
Cedrus consumes H.264 ref_pic_list0/ref_pic_list1 entries from the stateless slice control and later uses their indices to look up decode->dpb[] in _cedrus_write_ref_list().
Rejecting such controls in cedrus_try_ctrl() would break existing userspace, since stateless H.264 reference lists may legitimately carry out-of-range indices for missing references. Instead, guard the actual DPB lookup in Cedrus and skip entries whose indices do not fit the fixed V4L2_H264_NUM_DPB_ENTRIES array.
This keeps the fix local to the driver use site and avoids out-of-bounds reads from malformed or unsupported reference list entries.
References
- https://git.kernel.org/stable/c/0af8945fcae742d099f59f3c725eb67235953a31
- https://git.kernel.org/stable/c/10358ea986c3c85516d1c8206486464f79d36e76
- https://git.kernel.org/stable/c/2ee8327c85b3ac7b532d2d6a1e3a295d5ad7414a
- https://git.kernel.org/stable/c/9924cb548ee7753a6473997949c3ec48092de0b0
- https://git.kernel.org/stable/c/e53112c2de88982e66c369aee2120d5efd78df30