* [PATCH] net: usb: fix memory leak in smsc75xx_bind
@ 2021-05-24 20:02 Pavel Skripkin
2021-05-24 21:30 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Skripkin @ 2021-05-24 20:02 UTC (permalink / raw)
To: steve.glendinning, davem, kuba
Cc: netdev, linux-usb, linux-kernel, Pavel Skripkin, stable,
syzbot+b558506ba8165425fee2
Syzbot reported memory leak in smsc75xx_bind().
The problem was is non-freed memory in case of
errors after memory allocation.
backtrace:
[<ffffffff84245b62>] kmalloc include/linux/slab.h:556 [inline]
[<ffffffff84245b62>] kzalloc include/linux/slab.h:686 [inline]
[<ffffffff84245b62>] smsc75xx_bind+0x7a/0x334 drivers/net/usb/smsc75xx.c:1460
[<ffffffff82b5b2e6>] usbnet_probe+0x3b6/0xc30 drivers/net/usb/usbnet.c:1728
Fixes: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver")
Cc: stable@kernel.vger.org
Reported-and-tested-by: syzbot+b558506ba8165425fee2@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
drivers/net/usb/smsc75xx.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
index f8cdabb9ef5a..b286993da67c 100644
--- a/drivers/net/usb/smsc75xx.c
+++ b/drivers/net/usb/smsc75xx.c
@@ -1483,7 +1483,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
ret = smsc75xx_wait_ready(dev, 0);
if (ret < 0) {
netdev_warn(dev->net, "device not ready in smsc75xx_bind\n");
- return ret;
+ goto err;
}
smsc75xx_init_mac_address(dev);
@@ -1492,7 +1492,7 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
ret = smsc75xx_reset(dev);
if (ret < 0) {
netdev_warn(dev->net, "smsc75xx_reset error %d\n", ret);
- return ret;
+ goto err;
}
dev->net->netdev_ops = &smsc75xx_netdev_ops;
@@ -1502,6 +1502,10 @@ static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE;
return 0;
+
+err:
+ kfree(pdata);
+ return ret;
}
static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
--
2.31.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: usb: fix memory leak in smsc75xx_bind
2021-05-24 20:02 [PATCH] net: usb: fix memory leak in smsc75xx_bind Pavel Skripkin
@ 2021-05-24 21:30 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-05-24 21:30 UTC (permalink / raw)
To: Pavel Skripkin
Cc: steve.glendinning, davem, kuba, netdev, linux-usb, linux-kernel,
stable, syzbot+b558506ba8165425fee2
Hello:
This patch was applied to netdev/net.git (refs/heads/master):
On Mon, 24 May 2021 23:02:08 +0300 you wrote:
> Syzbot reported memory leak in smsc75xx_bind().
> The problem was is non-freed memory in case of
> errors after memory allocation.
>
> backtrace:
> [<ffffffff84245b62>] kmalloc include/linux/slab.h:556 [inline]
> [<ffffffff84245b62>] kzalloc include/linux/slab.h:686 [inline]
> [<ffffffff84245b62>] smsc75xx_bind+0x7a/0x334 drivers/net/usb/smsc75xx.c:1460
> [<ffffffff82b5b2e6>] usbnet_probe+0x3b6/0xc30 drivers/net/usb/usbnet.c:1728
>
> [...]
Here is the summary with links:
- net: usb: fix memory leak in smsc75xx_bind
https://git.kernel.org/netdev/net/c/46a8b29c6306
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
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2021-05-24 21:30 ` patchwork-bot+netdevbpf
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