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authorJ. Bruce Fields <bfields@redhat.com>2015-04-21 15:25:39 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-06 22:04:05 +0200
commit6fd154a83b18bc81aa3f1071e74c36d9076ff4b9 (patch)
tree9b2697790255ac8d19f8f0988fc0f9d123de55ff /fs
parente2efc21fbad9a8d055586716fad4d4baaf210b56 (diff)
nfsd4: disallow SEEK with special stateids
commit 980608fb50aea34993ba956b71cd4602aa42b14b upstream. If the client uses a special stateid then we'll pass a NULL file to vfs_llseek. Fixes: 24bab491220f " NFSD: Implement SEEK" Cc: Anna Schumaker <Anna.Schumaker@Netapp.com> Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfsd/nfs4proc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 591296722117..5416968b3fb3 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1071,6 +1071,8 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
return status;
}
+ if (!file)
+ return nfserr_bad_stateid;
switch (seek->seek_whence) {
case NFS4_CONTENT_DATA: