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media: cedrus: skip invalid H.264 reference list entries

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.

Affected products

Linux
  • <5.10
  • =<6.6.*
  • =<*
  • <0af8945fcae742d099f59f3c725eb67235953a31
  • <e53112c2de88982e66c369aee2120d5efd78df30
  • <9924cb548ee7753a6473997949c3ec48092de0b0
  • =<6.12.*
  • =<6.18.*
  • =<7.1.*
  • ==5.10
  • <2ee8327c85b3ac7b532d2d6a1e3a295d5ad7414a
  • <10358ea986c3c85516d1c8206486464f79d36e76