Commit cd0b16c1 authored Oct 13, 2012 by Trond Myklebust Committed by J. Bruce Fields Oct 17, 2012

NLM: nlm_lookup_file() may return NLMv4-specific error codes



If the filehandle is stale, or open access is denied for some reason,
nlm_fopen() may return one of the NLMv4-specific error codes nlm4_stale_fh
or nlm4_failed. These get passed right through nlm_lookup_file(),
and so when nlmsvc_retrieve_args() calls the latter, it needs to filter
the result through the cast_status() machinery.

Failure to do so, will trigger the BUG_ON() in encode_nlm_stat...

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Reported-by: Larry McVoy <lm@bitmover.com>
Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

parent ddffeb8c

fs/lockd/clntxdr.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -223,7 +223,7 @@ static void encode_nlm_stat(struct xdr_stream *xdr,
		{
		__be32 *p;

		BUG_ON(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD);
		WARN_ON_ONCE(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD);
		p = xdr_reserve_space(xdr, 4);
		*p = stat;
		}

fs/lockd/svcproc.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -68,7 +68,8 @@ nlmsvc_retrieve_args(struct svc_rqst rqstp, struct nlm_args argp,

		/* Obtain file pointer. Not used by FREE_ALL call. */
		if (filp != NULL) {
		if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
		error = cast_status(nlm_lookup_file(rqstp, &file, &lock->fh));
		if (error != 0)
		goto no_locks;
		*filp = file;