p9_client_readdir() fix

commit 71d6ad08379304128e4bdfaf0b4185d54375423e upstream.

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

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/9p/client.c b/net/9p/client.c
index e95817801fc7f24c4b582b3948aa6fa8080f908c..87173bb264105e06d5b7be82896b8c4088995b76 100644 (file)
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -2056,6 +2056,10 @@ int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
                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);