Description
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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 1dfedb293943e491379c9302b428e6f920a73d12affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < f18c1f2a88ca91357916997cdb0f7adaf14fc497affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 7bcd5e318876ac638c8ceade7a648e76ac8c48e1affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 41f6ba6c98a618043d2cd71030bf9a752dfab8b2affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 301670dcd098c1fe5c2fe90fb3c7a8f4814d2351affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < be5c35960e5ead70862736161836e2d1bc7352dcaffected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 373457de14281c1fc7cace6fc4c8a267fc176673affected1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 17ad31b3a43b72aec3a3d83605891e1397d0d065affected
Linux Linux
Default version status: affected
2.6.12affected0 to < 2.6.12unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.167 to ≤ 6.1.*unaffected6.6.130 to ≤ 6.6.*unaffected6.12.78 to ≤ 6.12.*unaffected6.18.20 to ≤ 6.18.*unaffected6.19.10 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
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 ↗