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| author | Gustavo F. Padovan <padovan@profusion.mobi> | 2010-05-11 22:02:00 -0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2010-07-21 10:39:07 -0700 |
| commit | 260000896750690b774d4343294ae5cbff1423e5 (patch) | |
| tree | 696f1a945371bb3bd363dd8741eec86b22920e66 /net/bluetooth | |
| parent | 45d65c46acc39945219eeb3752367ee80ed82799 (diff) | |
| download | linux-260000896750690b774d4343294ae5cbff1423e5.tar.gz linux-260000896750690b774d4343294ae5cbff1423e5.tar.bz2 linux-260000896750690b774d4343294ae5cbff1423e5.zip | |
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.c | 22 |
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) |