Description
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix cpntf publish race in nfs4_init_cp_state nfs4_alloc_init_cpntf_state() published the new cpntf entry into the s2s_cp_stateids IDR (with cs_type set) in one s2s_cp_lock section, then took the lock again to list_add() it onto p_stid->sc_cp_list. In the gap the entry is reachable by so_id but cp_list is still {NULL,NULL} from kzalloc. A racing OFFLOAD_CANCEL (so_id is echoed to the client as cnr_stateid, so any NFSv4.2 client can drive it) reaches manage_cpntf_state() -> _free_cpntf_state_locked() and does list_del() on the zeroed list_head, oopsing the server. Fold the cs_type assignment and the list_add() into the same critical section as idr_alloc_cyclic(), so a concurrent lookup either misses the entry or sees a fully linked cp_list. INIT_LIST_HEAD() the entry after allocation and switch _free_cpntf_state_locked() to list_del_init() so a stale unlink is a no-op. nfs4_init_copy_state() passes NULL p_stid and skips the list_add, preserving NFS4_COPY_STID semantics.
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
624322f1adc58acd0b69f77a6ddc764207e97241 to < 63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3affected624322f1adc58acd0b69f77a6ddc764207e97241 to < 6ac469a274e3c7d87fc46ba46d83b95009680407affected624322f1adc58acd0b69f77a6ddc764207e97241 to < 8eeca993357a0bc35aaefebfd7462ac7b0a21d9aaffected624322f1adc58acd0b69f77a6ddc764207e97241 to < bfeac42d9074e539bacd1898dd8c14b7f5776620affected624322f1adc58acd0b69f77a6ddc764207e97241 to < 21d6c5957f5ca97d7352e60f55ea412beb9419f5affected624322f1adc58acd0b69f77a6ddc764207e97241 to < a631a26a8777bb235eabd478bbbaf26a4db750bfaffected624322f1adc58acd0b69f77a6ddc764207e97241 to < c7270f62e7a05a2ee68aa2b74262b658a14463bdaffected624322f1adc58acd0b69f77a6ddc764207e97241 to < be3a5c1d857b0dcbc11796cea603ef25834f75b2affected
Linux Linux
Default version status: affected
5.6affected0 to < 5.6unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.109 to ≤ 6.12.*unaffected6.18.50 to ≤ 6.18.*unaffected7.2.4 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/63e18fc65587fd3f7b4c6d70e96d32fc41d82ba3 ↗
- https://git.kernel.org/stable/c/6ac469a274e3c7d87fc46ba46d83b95009680407 ↗
- https://git.kernel.org/stable/c/8eeca993357a0bc35aaefebfd7462ac7b0a21d9a ↗
- https://git.kernel.org/stable/c/bfeac42d9074e539bacd1898dd8c14b7f5776620 ↗
- https://git.kernel.org/stable/c/21d6c5957f5ca97d7352e60f55ea412beb9419f5 ↗
- https://git.kernel.org/stable/c/a631a26a8777bb235eabd478bbbaf26a4db750bf ↗
- https://git.kernel.org/stable/c/c7270f62e7a05a2ee68aa2b74262b658a14463bd ↗
- https://git.kernel.org/stable/c/be3a5c1d857b0dcbc11796cea603ef25834f75b2 ↗