Description
In the Linux kernel, the following vulnerability has been resolved: rpcrdma: arm rn_done before publishing the notification rpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before storing the caller's callback in rn->rn_done. The xarray makes @rn reachable to rpcrdma_remove_one(), which walks rd_xa and invokes rn->rn_done(rn) for every registered notification. A device removal that races a fresh registration can therefore observe @rn with rn_done still NULL, because the notification objects are zero allocated by their owners, and call through a NULL function pointer. Store rn->rn_done before xa_alloc() publishes @rn. The xarray's store-side and load-side ordering then guarantees that any CPU which finds @rn in rd_xa also observes the armed callback. rpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel for a completed registration, so the early store must not survive a failed registration. Clear rn_done again when xa_alloc() fails. Were it left set, the failed-accept cleanup path would call rpcrdma_rn_unregister() on an @rn that was never inserted, erasing an unrelated rd_xa slot and underflowing rd_kref.
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
7e86845a0346efc95fddaa97ce5cd6a8bda8c71c to < f9fe3cad43c42d874a388583552b39b411d886ebaffected7e86845a0346efc95fddaa97ce5cd6a8bda8c71c to < 3c97b8e76ca2bba9e8770571413aed694068e78eaffected7e86845a0346efc95fddaa97ce5cd6a8bda8c71c to < ea0408273ccf5df1fb52d9a1b9db4d31600dcb36affected7e86845a0346efc95fddaa97ce5cd6a8bda8c71c to < 5b06f706374c37375bdff9d21cc10e61df925a92affected
Linux Linux
Default version status: affected
6.11affected0 to < 6.11unaffected6.12.111 to ≤ 6.12.*unaffected6.18.51 to ≤ 6.18.*unaffected7.2.5 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected