[PATCH v2] rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()

[pip-izony <eeodqql09@gmail.com>]

From: Seungjin Bae <eeodqql09@gmail.com>

The rtl8187_rx_cb() calculates the rx descriptor header address
by subtracting its size from the skb tail pointer.
However, it does not validate if the received packet
(skb->len from urb->actual_length) is large enough to contain this
header.

If a truncated packet is received, this will lead to a buffer
underflow, reading memory before the start of the skb data area,
and causing a kernel panic.

This patch adds length checks for both rtl8187 and rtl8187b descriptor
headers before attempting to access them, dropping the packet cleanly
if the check fails.

Fixes: 6f7853f3cbe4 ("rtl8187: change rtl8187_dev.c to support RTL8187B (part 2)")
Signed-off-by: Seungjin Bae <eeodqql09@gmail.com>
---
 v1 -> v2: Addressing feedback from Ping-Ke Shih

 .../net/wireless/realtek/rtl818x/rtl8187/dev.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c b/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
index 0c5c66401daa..4d0b408b4e33 100644
--- a/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
+++ b/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
@@ -344,8 +344,13 @@ static void rtl8187_rx_cb(struct urb *urb)
 	}
 
 	if (!priv->is_rtl8187b) {
-		struct rtl8187_rx_hdr *hdr =
-			(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
+		struct rtl8187_rx_hdr *hdr;
+
+		if (skb->len < sizeof(struct rtl8187_rx_hdr)) {
+			dev_kfree_skb_irq(skb);
+			return;
+		}
+		hdr = (typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
 		flags = le32_to_cpu(hdr->flags);
 		/* As with the RTL8187B below, the AGC is used to calculate
 		 * signal strength. In this case, the scaling
@@ -355,8 +360,13 @@ static void rtl8187_rx_cb(struct urb *urb)
 		rx_status.antenna = (hdr->signal >> 7) & 1;
 		rx_status.mactime = le64_to_cpu(hdr->mac_time);
 	} else {
-		struct rtl8187b_rx_hdr *hdr =
-			(typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
+		struct rtl8187b_rx_hdr *hdr;
+
+		if (skb->len < sizeof(struct rtl8187b_rx_hdr)) {
+			dev_kfree_skb_irq(skb);
+			return;
+		}
+		hdr = (typeof(hdr))(skb_tail_pointer(skb) - sizeof(*hdr));
 		/* The Realtek datasheet for the RTL8187B shows that the RX
 		 * header contains the following quantities: signal quality,
 		 * RSSI, AGC, the received power in dB, and the measured SNR.
-- 
2.43.0