[PATCH AUTOSEL 4.19 2/9] ca8210: fix mac_len negative array access

[Sasha Levin]

From: Alexander Aring <aahringo@xxxxxxxxxx>

[ Upstream commit 6c993779ea1d0cccdb3a5d7d45446dd229e610a3 ]

This patch fixes a buffer overflow access of skb->data if
ieee802154_hdr_peek_addrs() fails.

Reported-by: lianhui tang <bluetlh@xxxxxxxxx>
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230217042504.3303396-1-aahringo@xxxxxxxxxx
Signed-off-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ieee802154/ca8210.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index 917edb3d04b78..2d4471b77fa7c 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -1954,6 +1954,8 @@ static int ca8210_skb_tx(
 	 * packet
 	 */
 	mac_len = ieee802154_hdr_peek_addrs(skb, &header);
+	if (mac_len < 0)
+		return mac_len;
 
 	secspec.security_level = header.sec.level;
 	secspec.key_id_mode = header.sec.key_id_mode;
-- 
2.39.2