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[PATCH 3.16 154/178] p9_client_readdir() fix

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  [PATCH 3.16 154/178] p9_client_readdir() fix Ben Hutchings <ben@decadent.org.uk> - 2017-07-16 16:40 +0200

#1688363 — [PATCH 3.16 154/178] p9_client_readdir() fix

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

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

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

--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -2107,6 +2107,10 @@ 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_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
 

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