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authorChuck Lever <chuck.lever@oracle.com>2021-09-16 23:24:54 +0200
committerChuck Lever <chuck.lever@oracle.com>2021-09-17 16:35:10 +0200
commit89c485c7a3ecbc2ebd568f9c9c2edf3a8cf7485b (patch)
treef07b9c5c7d3a1a3fc251e693ceac5c8843ebeed8
parentSUNRPC: improve error response to over-size gss credential (diff)
downloadlinux-89c485c7a3ecbc2ebd568f9c9c2edf3a8cf7485b.tar.xz
linux-89c485c7a3ecbc2ebd568f9c9c2edf3a8cf7485b.zip
NLM: Fix svcxdr_encode_owner()
Dai Ngo reports that, since the XDR overhaul, the NLM server crashes when the TEST procedure wants to return NLM_DENIED. There is a bug in svcxdr_encode_owner() that none of our standard test cases found. Replace the open-coded function with a call to an appropriate pre-fabricated XDR helper. Reported-by: Dai Ngo <Dai.Ngo@oracle.com> Fixes: a6a63ca5652e ("lockd: Common NLM XDR helpers") Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
-rw-r--r--fs/lockd/svcxdr.h13
1 files changed, 2 insertions, 11 deletions
diff --git a/fs/lockd/svcxdr.h b/fs/lockd/svcxdr.h
index c69a0bb76c94..4f1a451da5ba 100644
--- a/fs/lockd/svcxdr.h
+++ b/fs/lockd/svcxdr.h
@@ -134,18 +134,9 @@ svcxdr_decode_owner(struct xdr_stream *xdr, struct xdr_netobj *obj)
static inline bool
svcxdr_encode_owner(struct xdr_stream *xdr, const struct xdr_netobj *obj)
{
- unsigned int quadlen = XDR_QUADLEN(obj->len);
- __be32 *p;
-
- if (xdr_stream_encode_u32(xdr, obj->len) < 0)
- return false;
- p = xdr_reserve_space(xdr, obj->len);
- if (!p)
+ if (obj->len > XDR_MAX_NETOBJ)
return false;
- p[quadlen - 1] = 0; /* XDR pad */
- memcpy(p, obj->data, obj->len);
-
- return true;
+ return xdr_stream_encode_opaque(xdr, obj->data, obj->len) > 0;
}
#endif /* _LOCKD_SVCXDR_H_ */