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[Backport v2.4-branch] Bluetooth: L2CAP: Fix missing buffer length check for sdu_len #33514

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merged 1 commit into from Mar 23, 2021
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[Backport v2.4-branch] Bluetooth: L2CAP: Fix missing buffer length check for sdu_len #33514

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6 changes: 6 additions & 0 deletions subsys/bluetooth/host/l2cap.c
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Expand Up @@ -2185,6 +2185,12 @@ static void l2cap_chan_le_recv(struct bt_l2cap_le_chan *chan,
return;
}

if (buf->len < 2) {
BT_WARN("Too short data packet");
bt_l2cap_chan_disconnect(&chan->chan);
return;
}

sdu_len = net_buf_pull_le16(buf);

BT_DBG("chan %p len %u sdu_len %u", chan, buf->len, sdu_len);
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