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nfsd4: disallow SEEK with special stateids

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

Fixes: 24bab49122 " 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>
This commit is contained in:
J. Bruce Fields 2015-04-21 15:25:39 -04:00
parent 5ba4a25ab7
commit 980608fb50
1 changed files with 2 additions and 0 deletions
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2
fs/nfsd/nfs4proc.c
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@ -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: