nfsd: add filehandle match check to nfsd4_delegreturn()

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nfsd4_delegreturn() is the only stateful NFSv4 operation that does
not call nfs4_check_fh() to verify the delegation's file matches
cstate->current_fh. A client can DELEGRETURN with a mismatched
filehandle, destroying the correct delegation but waking the wrong
inode's waiters.

Add the missing nfs4_check_fh() call after the generation check.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260611-nfsd-testing-v2-6-5b90e276f2d9@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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Jeff Layton 2026-06-11 16:00:49 -04:00 • committed by Chuck Lever

parent 2c79127321

commit 04cce9d79f

1 changed files with 4 additions and 0 deletions

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fs/nfsd/nfs4state.c

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