From: Eric Van Hensbergen <ericvh@gmail.com>
Date: Thu, 14 Jul 2011 00:12:18 +0000 (-0500)
Subject: net/9p: fix client code to fail more gracefully on protocol error
X-Git-Tag: firefly_0821_release~7541^2~2789
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7b551b70695eb39e8bfcc29ae9883e66254cb12d;p=firefly-linux-kernel-4.4.55.git

net/9p: fix client code to fail more gracefully on protocol error

commit b85f7d92d7bd7e3298159e8b1eed8cb8cbbb0348 upstream.

There was a BUG_ON to protect against a bad id which could be dealt with
more gracefully.

Reported-by: Natalie Orlin <norlin@us.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/net/9p/client.c b/net/9p/client.c
index 9e3b0e640da1..ffaf0df6e304 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -280,7 +280,8 @@ struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
 	 * buffer to read the data into */
 	tag++;
 
-	BUG_ON(tag >= c->max_tag);
+	if(tag >= c->max_tag)
+		return NULL;
 
 	row = tag / P9_ROW_MAXTAG;
 	col = tag % P9_ROW_MAXTAG;