TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

net: usb: smsc95xx: Limit packet length to skb->len

Browse Source 
[ Upstream commit ff821092cf ]

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.

Fixes: 2f7ca802bd ("net: Add SMSC LAN9500 USB2.0 10/100 ethernet adapter driver")
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20230316101954.75836-1-szymon.heidrich@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Szymon Heidrich
2023-03-16 11:19:54 +01:00
committed by Greg Kroah-Hartman
parent c09cdf6eb8
commit 33d1603a38
1 changed files with 6 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/usb/smsc95xx.c
+6
View File
@@ -1824,6 +1824,12 @@ static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
size = (u16)((header & RX_STS_FL_) >> 16);
align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
if (unlikely(size > skb->len)) {
netif_dbg(dev, rx_err, dev->net,
"size err header=0x%08x\n", header);
return 0;
}
if (unlikely(header & RX_STS_ES_)) {
netif_dbg(dev, rx_err, dev->net,
"Error header=0x%08x\n", header);