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authorSzymon Heidrich <szymon.heidrich@gmail.com>2023-03-16 13:19:54 +0300
committerJakub Kicinski <kuba@kernel.org>2023-03-18 07:58:26 +0300
commitff821092cf02a70c2bccd2d19269f01e29aa52cf (patch)
treecc1063d1f9c09c3e4ca0030e1b1cb6983176acb4 /drivers/net/usb/smsc95xx.c
parent30796d0dcb6e41c6558a07950f2ce60c209da867 (diff)
downloadlinux-ff821092cf02a70c2bccd2d19269f01e29aa52cf.tar.xz
net: usb: smsc95xx: Limit packet length to skb->len
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: 2f7ca802bdae ("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>
Diffstat (limited to 'drivers/net/usb/smsc95xx.c')
-rw-r--r--drivers/net/usb/smsc95xx.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index 32d2c60d334d..563ecd27b93e 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -1833,6 +1833,12 @@ 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);