linux-kernel - [PATCH] [9/106] irda: validate peer name and attribute lengths

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Message-Id: <20110426211247.3CC9A3E1887@tassilo.jf.intel.com>
Date:	Tue, 26 Apr 2011 14:12:47 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	drosenberg@...curity.com, davem@...emloft.net, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [9/106] irda: validate peer name and attribute lengths

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

------------------
From: Dan Rosenberg <drosenberg@...curity.com>

commit d370af0ef7951188daeb15bae75db7ba57c67846 upstream.

Length fields provided by a peer for names and attributes may be longer
than the destination array sizes.  Validate lengths to prevent stack
buffer overflows.

Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 net/irda/iriap.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-2.6.35.y/net/irda/iriap.c
===================================================================
--- linux-2.6.35.y.orig/net/irda/iriap.c
+++ linux-2.6.35.y/net/irda/iriap.c
@@ -656,10 +656,16 @@ static void iriap_getvaluebyclass_indica
 	n = 1;
 
 	name_len = fp[n++];
+
+	IRDA_ASSERT(name_len < IAS_MAX_CLASSNAME + 1, return;);
+
 	memcpy(name, fp+n, name_len); n+=name_len;
 	name[name_len] = '\0';
 
 	attr_len = fp[n++];
+
+	IRDA_ASSERT(attr_len < IAS_MAX_ATTRIBNAME + 1, return;);
+
 	memcpy(attr, fp+n, attr_len); n+=attr_len;
 	attr[attr_len] = '\0';
 
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