[03/44] irda: Fix heap memory corruption in iriap.c

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

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

From: Samuel Ortiz <samuel@xxxxxxxxxx>

commit 37f9fc452d138dfc4da2ee1ce5ae85094efc3606 upstream.

While parsing the GetValuebyClass command frame, we could potentially write
passed the skb->data pointer.

Reported-by: Ilja Van Sprundel <ivansprundel@xxxxxxxxxxxx>
Signed-off-by: Samuel Ortiz <samuel@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/irda/iriap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/irda/iriap.c
+++ b/net/irda/iriap.c
@@ -501,7 +501,8 @@ static void iriap_getvaluebyclass_confir
 		IRDA_DEBUG(4, "%s(), strlen=%d\n", __func__, value_len);
 
 		/* Make sure the string is null-terminated */
-		fp[n+value_len] = 0x00;
+		if (n + value_len < skb->len)
+			fp[n + value_len] = 0x00;
 		IRDA_DEBUG(4, "Got string %s\n", fp+n);
 
 		/* Will truncate to IAS_MAX_STRING bytes */


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