Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: drm/dp: Fix OOB read when handling Post Cursor2 register The link_status array was not large enough to read the Adjust Request Post Cursor2 register, so remove the common helper function to avoid an OOB read, found with a -Warray-bounds build: drivers/gpu/drm/drm_dp_helper.c: In function 'drm_dp_get_adjust_request_post_cursor': drivers/gpu/drm/drm_dp_helper.c:59:27: error: array subscript 10 is outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'} [-Werror=array-bounds] 59 | return link_status[r - DP_LANE0_1_STATUS]; | ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/drm_dp_helper.c:147:51: note: while referencing 'link_status' 147 | u8 drm_dp_get_adjust_request_post_cursor(const u8 link_status[DP_LINK_STATUS_SIZE], | ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Replace the only user of the helper with an open-coded fetch and decode, similar to drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 79465e0ffeb9e4866939ea562bc55367be91e595 before aeaed9a9fe694f8b1462fb81e2d33298c929180b; affected 79465e0ffeb9e4866939ea562bc55367be91e595 before a2151490cc6c57b368d7974ffd447a8b36ade639 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.17.2 through 5.17.*; unaffected 5.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/aeaed9a9fe694f8b1462fb81e2d33298c929180b
- https://git.kernel.org/stable/c/a2151490cc6c57b368d7974ffd447a8b36ade639
ADP enrichment
No English description supplied.
No references supplied.