Commit 61c8c52c authored by J. Bruce Fields's avatar J. Bruce Fields Committed by Sasha Levin

nfsd4: disallow SEEK with special stateids

[ Upstream commit 980608fb ]

If the client uses a special stateid then we'll pass a NULL file to
vfs_llseek.

Fixes: 24bab491 " NFSD: Implement SEEK"
Cc: Anna Schumaker <Anna.Schumaker@Netapp.com>
Cc: stable@vger.kernel.org
Reported-by: default avatarChristoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent 5a9fb83e
...@@ -1028,6 +1028,8 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, ...@@ -1028,6 +1028,8 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n"); dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n");
return status; return status;
} }
if (!file)
return nfserr_bad_stateid;
switch (seek->seek_whence) { switch (seek->seek_whence) {
case NFS4_CONTENT_DATA: case NFS4_CONTENT_DATA:
......
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