nfsd: fix reply size estimate for GET_DIR_DELEGATION

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nfsd4_get_dir_delegation_rsize() returns its estimate in XDR words, but
the COMPOUND reply-size machinery works in bytes: every other op's
_rsize helper multiplies its word count by sizeof(__be32). Since
GET_DIR_DELEGATION is OP_MODIFIES_SOMETHING, this estimate is consulted
before the op executes to ensure the reply will fit. The ~4x too-small
estimate lets a compound near the session/reply limit pass the check,
grant a directory delegation, and then fail to encode the reply with
NFS4ERR_RESOURCE/REP_TOO_BIG, leaving the client without the returned
stateid.

Multiply the estimate by sizeof(__be32) like the other _rsize helpers.

Fixes: 33a1e6ea73 ("nfsd: trivial GET_DIR_DELEGATION support")
Cc: stable@vger.kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260616-dir-deleg-v7-17-6cbc7eac0ade@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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Jeff Layton 2026-06-16 07:59:00 -04:00 • committed by Chuck Lever

parent c10ce74117

commit 46f929b907

1 changed files with 1 additions and 1 deletions

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fs/nfsd/nfs4proc.c

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