5 Oct
2024
5 Oct
'24
11:23 a.m.
On 4 Oct 2024, at 18:04, Olga Kornievskaia wrote:
When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-tree or counter refcount underflow errors.
In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zerod counter.
CC: stable@vger.kernel.org Signed-off-by: Olga Kornievskaia okorniev@redhat.com
Reviewed-by: Benjamin Coddington bcodding@redhat.com
Ben