From 71d6ad08379304128e4bdfaf0b4185d54375423e Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 14 Apr 2017 17:22:18 -0400 Subject: p9_client_readdir() fix Don't assume that server is sane and won't return more data than asked for. Cc: stable@vger.kernel.org Signed-off-by: Al Viro --- net/9p/client.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/9p') diff --git a/net/9p/client.c b/net/9p/client.c index 3ce672af1596..8e5c6a8d0a37 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -2101,6 +2101,10 @@ 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_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); -- cgit v1.2.3