summaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorJ. Bruce Fields <bfields@redhat.com>2015-04-21 15:25:39 -0400
committerJ. Bruce Fields <bfields@redhat.com>2015-04-21 16:16:01 -0400
commit980608fb50aea34993ba956b71cd4602aa42b14b (patch)
treea6105aecef17dd3bc25bb1754acb87bbf0639255 /fs
parent5ba4a25ab7b13be528b23f85182f4d09cf7f71ad (diff)
downloadlinux-980608fb50aea34993ba956b71cd4602aa42b14b.tar.gz
linux-980608fb50aea34993ba956b71cd4602aa42b14b.tar.bz2
linux-980608fb50aea34993ba956b71cd4602aa42b14b.zip
nfsd4: disallow SEEK with special stateids
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> Cc: stable@vger.kernel.org Reported-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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 d0848fc6529e..4a8314f08a0e 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: