Description
In the Linux kernel, the following vulnerability has been resolved: NFSv4: remove callback IDR entry on client allocation failure nfs4_alloc_client() allocates an NFSv4.0 callback identifier before it finishes setting up the client. If any later initialization step fails, the error path frees the nfs_client directly with nfs_free_client(). That bypasses nfs_put_client(), which is where the callback IDR entry is removed during normal teardown. A failed allocation can therefore leave cb_ident_idr pointing at a freed nfs_client. A later NFSv4.0 callback lookup by cb_ident would find the stale pointer and take a reference to it. Make the callback IDR removal helper callable by the allocation failure path, and remove the callback identifier before freeing the client. This was found by a local static-analysis checker for publish-before-free lifetime bugs and confirmed by manual inspection.
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
f4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < 68c721391b761dbe38d5b0094d2bb6e8489ad92baffectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < 9bfdd0f591307b5198826a0e7a5b2f35f87acd2daffectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < 7c4812eb96bdcafb31a65b12f2aa96659429d1d4affectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < fc95ca82d5ae598c428ab5a00ae69f8526d59371affectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < 80b1c3d5a881f7d9081aa9f46da9742878a0f893affectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < 3f2387e8bfbc4efda5d77c3a11a028d0a119c48faffectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < 5891c03e150920618db0e9c4ea2d772abacdcfd1affectedf4eecd5da3422e82e88e36c33cbd2595eebcacb1 to < d05c2007b3d84ccba11dc6e9cb3202768cc72f14affected
Linux Linux
Default version status: affected
2.6.38affected0 to < 2.6.38unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/68c721391b761dbe38d5b0094d2bb6e8489ad92b ↗
- https://git.kernel.org/stable/c/9bfdd0f591307b5198826a0e7a5b2f35f87acd2d ↗
- https://git.kernel.org/stable/c/7c4812eb96bdcafb31a65b12f2aa96659429d1d4 ↗
- https://git.kernel.org/stable/c/fc95ca82d5ae598c428ab5a00ae69f8526d59371 ↗
- https://git.kernel.org/stable/c/80b1c3d5a881f7d9081aa9f46da9742878a0f893 ↗
- https://git.kernel.org/stable/c/3f2387e8bfbc4efda5d77c3a11a028d0a119c48f ↗
- https://git.kernel.org/stable/c/5891c03e150920618db0e9c4ea2d772abacdcfd1 ↗
- https://git.kernel.org/stable/c/d05c2007b3d84ccba11dc6e9cb3202768cc72f14 ↗