Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: of/overlay: only treat a positive changeset id as registered of_overlay_fdt_apply() stores the idr_alloc() return value in ovcs->id before checking it. On failure the stored id is negative, free_overlay_changeset()'s "if (ovcs->id)" check passes, idr_remove() is called with a negative id and list_del() runs on ovcs->ovcs_list, which is not initialized until after the id allocation. An allocation failure at that point dereferences NULL. Make free_overlay_changeset() treat only a strict-positive id as registered. The rest of the function already copes with a partially-initialized ovcs, so the error path stays a plain goto err_free_ovcs.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before cc688475c56d34a2b584141f9544cbe23360080d; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before c08a54df9d33dcd6ff089adc9434b2c008af3a39; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 0d1525fdcd3355672b7485d61e55df6824ab5ad1; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before c875407c34dadaef0599834ad9c815f4c9f50d15; affected 61b4de4e0b384f4a22c55c3bada604da49cec4e1 before 44081d708b5b885487bac792db78324b7b4c267d |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/cc688475c56d34a2b584141f9544cbe23360080d
- https://git.kernel.org/stable/c/c08a54df9d33dcd6ff089adc9434b2c008af3a39
- https://git.kernel.org/stable/c/0d1525fdcd3355672b7485d61e55df6824ab5ad1
- https://git.kernel.org/stable/c/c875407c34dadaef0599834ad9c815f4c9f50d15
- https://git.kernel.org/stable/c/44081d708b5b885487bac792db78324b7b4c267d