9p: fix oops in protocol stat parsing error path.

When we get an error on parsing a stat due to a protocol bug,
we can generate an oops during cleanup because we didn't
initialize the string pointers in the stat structure.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/net/9p/protocol.c b/net/9p/protocol.c
index 84fa212..29be524 100644 (file)
--- a/net/9p/protocol.c
+++ b/net/9p/protocol.c
@@ -215,9 +215,9 @@ p9pdu_vreadf(struct p9_fcall *pdu, int optional, const char *fmt, va_list ap)
                                struct p9_wstat *stbuf =
                                    va_arg(ap, struct p9_wstat *);
 
-                               stbuf->extension = NULL;
+                               memset(stbuf, 0, sizeof(struct p9_wstat));
                                stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
-                                   -1;
+                                                                       -1;
                                errcode =
                                    p9pdu_readf(pdu, optional,
                                                "wwdQdddqssss?sddd",