linux-kernel - [ 064/143] htb: fix sign extension bug

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Message-Id: <20140512003203.293568576@1wt.eu>
Date:	Mon, 12 May 2014 02:33:04 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 064/143] htb: fix sign extension bug

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: stephen hemminger <stephen@...workplumber.org>

[ Upstream commit cbd375567f7e4811b1c721f75ec519828ac6583f ]

When userspace passes a large priority value
the assignment of the unsigned value hopt->prio
to  signed int cl->prio causes cl->prio to become negative and the
comparison is with TC_HTB_NUMPRIO is always false.

The result is that HTB crashes by referencing outside
the array when processing packets. With this patch the large value
wraps around like other values outside the normal range.

See: https://bugzilla.kernel.org/show_bug.cgi?id=60669

Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/sched/sch_htb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 2f074d6..9ce5963 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -85,7 +85,7 @@ struct htb_class {
 	unsigned int children;
 	struct htb_class *parent;	/* parent class */
 
-	int prio;		/* these two are used only by leaves... */
+	u32 prio;		/* these two are used only by leaves... */
 	int quantum;		/* but stored for parent-to-leaf return */
 
 	union {
-- 
1.7.12.2.21.g234cd45.dirty



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