libertas_tf: prevent underflow in process_cmdrequest() (3348ef6a) · Commits · 戴 / test

If recvlength is less than MESSAGE_HEADER_LEN (4) we would end up corrupting memory. Fixes: ("libertas_tf: usb specific functions") Signed-off-by:

drivers/net/wireless/marvell/libertas_tf/if_usb.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -605,9 +605,10 @@ static inline void process_cmdrequest(int recvlength, uint8_t *recvbuff,
		{
		unsigned long flags;

		if (recvlength > LBS_CMD_BUFFER_SIZE) {
		if (recvlength < MESSAGE_HEADER_LEN \|\|
		recvlength > LBS_CMD_BUFFER_SIZE) {
		lbtf_deb_usbd(&cardp->udev->dev,
		"The receive buffer is too large\n");
		"The receive buffer is invalid: %d\n", recvlength);
		kfree_skb(skb);
		return;
		}