From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
[ Upstream commit 980608fb50aea34993ba956b71cd4602aa42b14b ]
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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 0beb023..6ed5859 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1028,6 +1028,8 @@ 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:
--
2.1.0
--
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