From: Gustavo F. Padovan <padovan@profusion.mobi>
Date: Sat, 1 May 2010 19:15:40 +0000 (-0300)
Subject: Bluetooth: Check the SDU size against the MTU value
X-Git-Tag: firefly_0821_release~9833^2~2087^2~206
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=052897ca5019d9157ae09e5e84eee2a9ef5dccc6;p=firefly-linux-kernel-4.4.55.git

Bluetooth: Check the SDU size against the MTU value

If the SDU size is greater than the MTU something is wrong, so report
an error.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
[jprvita@profusion.mobi: set err to appropriate errno value]
Signed-off-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
---

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 0889949b6896..e936913c921e 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -3338,6 +3338,11 @@ static int l2cap_sar_reassembly_sdu(struct sock *sk, struct sk_buff *skb, u16 co
 		pi->sdu_len = get_unaligned_le16(skb->data);
 		skb_pull(skb, 2);
 
+		if (pi->sdu_len > pi->imtu) {
+			err = -EMSGSIZE;
+			break;
+		}
+
 		pi->sdu = bt_skb_alloc(pi->sdu_len, GFP_ATOMIC);
 		if (!pi->sdu) {
 			err = -ENOMEM;