"len" can be negative here. It's harmless but pretty subtle and
scary looking so lets add a check for it.
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index a1b7a02..438f39e 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -4069,6 +4069,9 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn,
BT_DBG("scid 0x%4.4x flags 0x%2.2x result 0x%2.2x len %d", scid, flags,
result, len);
+ if (len < 0)
+ return -EINVAL;
+
chan = l2cap_get_chan_by_scid(conn, scid);
if (!chan)
return 0;
--
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