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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: a6a63ca565 ("lockd: Common NLM XDR helpers")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2021-09-16 17:24:54 -04:00
parent 0c217d5066
commit 89c485c7a3
1 changed files with 2 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
fs/lockd/svcxdr.h
View File

@ -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)
if (obj->len > XDR_MAX_NETOBJ)
return false;
p = xdr_reserve_space(xdr, obj->len);
if (!p)
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_ */