Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: avoid double drm_exec_fini() in userq validate When new_addition is true, amdgpu_userq_vm_validate() calls drm_exec_fini(&exec) before iterating over the collected HMM ranges and calling amdgpu_ttm_tt_get_user_pages(). If amdgpu_ttm_tt_get_user_pages() fails in that path, the code jumps to unlock_all and calls drm_exec_fini(&exec) a second time on the same exec object. drm_exec_fini() is not idempotent: it frees exec->objects and may also drop exec->contended and finalize the ww acquire context. Route that error path directly to the range cleanup once exec has already been finalized. Issue found using a prototype static analysis tool and confirmed by code review. (cherry picked from commit 2802952e4a07306da6ebe813ff1acacc5691851a)
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 42f148788469792df207751e2339ef2bb8a1e33e before c7c3ae7c01e5a0742b93cb9b40800bdd7f811e38; affected 42f148788469792df207751e2339ef2bb8a1e33e before 508babf310365f1107a2e8831c267c292a286818 |
| Linux / Linux | affected 6.19; unaffected 0 before 6.19; unaffected 7.0.10 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c7c3ae7c01e5a0742b93cb9b40800bdd7f811e38
- https://git.kernel.org/stable/c/508babf310365f1107a2e8831c267c292a286818
ADP enrichment
A flaw was found in the Linux kernel. A double free vulnerability exists in the `drm/amdgpu` component within the `userq validate` function. This issue arises because the `drm_exec_fini()` function is called twice on the same execution object, which is not designed to be idempotent. An attacker could potentially exploit this to cause a denial of service or lead to unpredictable system behavior.