From: Chuck Lever <chuck.lever@xxxxxxxxxx>
On Fri, 04 Oct 2024 18:04:03 -0400, 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.
>
> [...]
Applied to nfsd-fixes for v6.12, thanks!
[1/1] nfsd: fix possible badness in FREE_STATEID
commit: c88c150a467fcb670a1608e2272beeee3e86df6e
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Chuck Lever
