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authorGustavo F. Padovan <padovan@profusion.mobi>2010-05-11 22:02:00 -0300
committerMarcel Holtmann <marcel@holtmann.org>2010-07-21 10:39:07 -0700
commit260000896750690b774d4343294ae5cbff1423e5 (patch)
tree696f1a945371bb3bd363dd8741eec86b22920e66 /net/bluetooth
parent45d65c46acc39945219eeb3752367ee80ed82799 (diff)
Bluetooth: Check packet FCS earlier
This way, if FCS is enabled and the packet is corrupted, we just drop it without read it len, which could be corrupted. Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
-rw-r--r--net/bluetooth/l2cap.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 6094870d5d2a..8c9f577dd46d 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -4166,25 +4166,25 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
skb_pull(skb, 2);
len = skb->len;
+ /*
+ * We can just drop the corrupted I-frame here.
+ * Receiver will miss it and start proper recovery
+ * procedures and ask retransmission.
+ */
+ if (l2cap_check_fcs(pi, skb))
+ goto drop;
+
if (__is_sar_start(control) && __is_iframe(control))
len -= 2;
if (pi->fcs == L2CAP_FCS_CRC16)
len -= 2;
- /*
- * We can just drop the corrupted I-frame here.
- * Receiver will miss it and start proper recovery
- * procedures and ask retransmission.
- */
if (len > pi->mps) {
l2cap_send_disconn_req(pi->conn, sk);
goto drop;
}
- if (l2cap_check_fcs(pi, skb))
- goto drop;
-
req_seq = __get_reqseq(control);
req_seq_offset = (req_seq - pi->expected_ack_seq) % 64;
if (req_seq_offset < 0)
@@ -4224,6 +4224,9 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
skb_pull(skb, 2);
len = skb->len;
+ if (l2cap_check_fcs(pi, skb))
+ goto drop;
+
if (__is_sar_start(control))
len -= 2;
@@ -4233,9 +4236,6 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
if (len > pi->mps || len < 0 || __is_sframe(control))
goto drop;
- if (l2cap_check_fcs(pi, skb))
- goto drop;
-
tx_seq = __get_txseq(control);
if (pi->expected_tx_seq == tx_seq)

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