[PATCH 3.2 80/95] p9_client_readdir() fix

[Ben Hutchings]

3.2.91-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <v...@zeniv.linux.org.uk>

commit 71d6ad08379304128e4bdfaf0b4185d54375423e upstream.

Don't assume that server is sane and won't return more data than
asked for.

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 net/9p/client.c | 4 ++++
 1 file changed, 4 insertions(+)

--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -2056,6 +2056,10 @@ int p9_client_readdir(struct p9_fid *fid
                trace_9p_protocol_dump(clnt, req->rc);
                goto free_and_error;
        }
+       if (rsize < count) {
+               pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
+               count = rsize;
+       }
 
        P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);