From: Gustavo F. Padovan Date: Sat, 1 May 2010 19:15:37 +0000 (-0300) Subject: Bluetooth: Check the minimum {I,S}-frame size into L2CAP X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=277ffbe362823d18a17792fbd8e507010e666299;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git Bluetooth: Check the minimum {I,S}-frame size into L2CAP All packets with size fewer than the minimum specified is dropped. Note that the size of the l2cap basic header, FCS and SAR fields are already subtracted of len at the moment of the size check. Signed-off-by: Gustavo F. Padovan Reviewed-by: João Paulo Rechi Vita Signed-off-by: Marcel Holtmann --- diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c index 36cd4e4e6ad1..ac00f5fac2d2 100644 --- a/net/bluetooth/l2cap.c +++ b/net/bluetooth/l2cap.c @@ -3627,10 +3627,17 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk if (l2cap_check_fcs(pi, skb)) goto drop; - if (__is_iframe(control)) + if (__is_iframe(control)) { + if (len < 4) + goto drop; + l2cap_data_channel_iframe(sk, control, skb); - else + } else { + if (len != 0) + goto drop; + l2cap_data_channel_sframe(sk, control, skb); + } goto done; @@ -3645,7 +3652,8 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk if (pi->fcs == L2CAP_FCS_CRC16) len -= 2; - if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || __is_sframe(control)) + if (len > L2CAP_DEFAULT_MAX_PDU_SIZE || len < 4 + || __is_sframe(control)) goto drop; if (l2cap_check_fcs(pi, skb))