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| author | Gustavo F. Padovan <padovan@profusion.mobi> | 2010-05-01 16:15:37 -0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2010-05-10 09:28:46 +0200 |
| commit | 277ffbe362823d18a17792fbd8e507010e666299 (patch) | |
| tree | ae598f002d41ed2e6b734caf44a19127ef55bf43 /net/bluetooth | |
| parent | 1d8f5d16913d74e428950ee02fe9ff7e6391c120 (diff) | |
| download | linux-277ffbe362823d18a17792fbd8e507010e666299.tar.gz linux-277ffbe362823d18a17792fbd8e507010e666299.tar.bz2 linux-277ffbe362823d18a17792fbd8e507010e666299.zip | |
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 <padovan@profusion.mobi>
Reviewed-by: João Paulo Rechi Vita <jprvita@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/l2cap.c | 14 |
1 files changed, 11 insertions, 3 deletions
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)) |