Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix cache_request leak in cache_release When a reader's file descriptor is closed while in the middle of reading a cache_request (rp->offset != 0), cache_release() decrements the request's readers count but never checks whether it should free the request. In cache_read(), when readers drops to 0 and CACHE_PENDING is clear, the cache_request is removed from the queue and freed along with its buffer and cache_head reference. cache_release() lacks this cleanup. The only other path that frees requests with readers == 0 is cache_dequeue(), but it runs only when CACHE_PENDING transitions from set to clear. If that transition already happened while readers was still non-zero, cache_dequeue() will have skipped the request, and no subsequent call will clean it up. Add the same cleanup logic from cache_read() to cache_release(): after decrementing readers, check if it reached 0 with CACHE_PENDING clear, and if so, dequeue and free the cache_request.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 1dfedb293943e491379c9302b428e6f920a73d12; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f18c1f2a88ca91357916997cdb0f7adaf14fc497; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 7bcd5e318876ac638c8ceade7a648e76ac8c48e1; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 41f6ba6c98a618043d2cd71030bf9a752dfab8b2; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 301670dcd098c1fe5c2fe90fb3c7a8f4814d2351; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before be5c35960e5ead70862736161836e2d1bc7352dc; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 373457de14281c1fc7cace6fc4c8a267fc176673; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 17ad31b3a43b72aec3a3d83605891e1397d0d065 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.78 through 6.12.*; unaffected 6.18.20 through 6.18.*; unaffected 6.19.10 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1dfedb293943e491379c9302b428e6f920a73d12
- https://git.kernel.org/stable/c/f18c1f2a88ca91357916997cdb0f7adaf14fc497
- https://git.kernel.org/stable/c/7bcd5e318876ac638c8ceade7a648e76ac8c48e1
- https://git.kernel.org/stable/c/41f6ba6c98a618043d2cd71030bf9a752dfab8b2
- https://git.kernel.org/stable/c/301670dcd098c1fe5c2fe90fb3c7a8f4814d2351
- https://git.kernel.org/stable/c/be5c35960e5ead70862736161836e2d1bc7352dc
- https://git.kernel.org/stable/c/373457de14281c1fc7cace6fc4c8a267fc176673
- https://git.kernel.org/stable/c/17ad31b3a43b72aec3a3d83605891e1397d0d065