shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-05 18:41:58 +09:00
Code Issues Packages Projects Releases Wiki Activity

net: usb: lan78xx: Limit packet length to skb->len

Browse Source 
[ Upstream commit 7f247f5a2c ]

Packet length retrieved from descriptor may be larger than
the actual socket buffer length. In such case the cloned
skb passed up the network stack will leak kernel memory contents.

Additionally prevent integer underflow when size is less than
ETH_FCS_LEN.

Fixes: 55d7de9de6 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Szymon Heidrich
2023-03-18 10:25:52 +01:00
committed by Greg Kroah-Hartman
parent 5fc2c4e311
commit 83de349674
1 changed files with 17 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/net/usb/lan78xx.c
View File

@@ -3579,13 +3579,29 @@ static int lan78xx_rx(struct lan78xx_net *dev, struct sk_buff *skb,
size = (rx_cmd_a & RX_CMD_A_LEN_MASK_);
align_count = (4 - ((size + RXW_PADDING) % 4)) % 4;
if (unlikely(size > skb->len)) {
netif_dbg(dev, rx_err, dev->net,
"size err rx_cmd_a=0x%08x\n",
rx_cmd_a);
return 0;
}
if (unlikely(rx_cmd_a & RX_CMD_A_RED_)) {
netif_dbg(dev, rx_err, dev->net,
"Error rx_cmd_a=0x%08x", rx_cmd_a);
} else {
u32 frame_len = size - ETH_FCS_LEN;
u32 frame_len;
struct sk_buff *skb2;
if (unlikely(size < ETH_FCS_LEN)) {
netif_dbg(dev, rx_err, dev->net,
"size err rx_cmd_a=0x%08x\n",
rx_cmd_a);
return 0;
}
frame_len = size - ETH_FCS_LEN;
skb2 = napi_alloc_skb(&dev->napi, frame_len);
if (!skb2)
return 0;