This is a note to let you know that I've just added the patch titled
net: moxa: fix UAF in moxart_mac_probe
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-moxa-fix-uaf-in-moxart_mac_probe.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c78eaeebe855fd93f2e77142ffd0404a54070d84 Mon Sep 17 00:00:00 2001
From: Pavel Skripkin <paskripkin@xxxxxxxxx>
Date: Fri, 9 Jul 2021 17:09:53 +0300
Subject: net: moxa: fix UAF in moxart_mac_probe
From: Pavel Skripkin <paskripkin@xxxxxxxxx>
commit c78eaeebe855fd93f2e77142ffd0404a54070d84 upstream.
In case of netdev registration failure the code path will
jump to init_fail label:
init_fail:
netdev_err(ndev, "init failed\n");
moxart_mac_free_memory(ndev);
irq_map_fail:
free_netdev(ndev);
return ret;
So, there is no need to call free_netdev() before jumping
to error handling path, since it can cause UAF or double-free
bug.
Fixes: 6c821bd9edc9 ("net: Add MOXA ART SoCs ethernet driver")
Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/moxa/moxart_ether.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -518,10 +518,8 @@ static int moxart_mac_probe(struct platf
SET_NETDEV_DEV(ndev, &pdev->dev);
ret = register_netdev(ndev);
- if (ret) {
- free_netdev(ndev);
+ if (ret)
goto init_fail;
- }
netdev_dbg(ndev, "%s: IRQ=%d address=%pM\n",
__func__, ndev->irq, ndev->dev_addr);
Patches currently in stable-queue which might be from paskripkin@xxxxxxxxx are
queue-4.4/net-ti-fix-uaf-in-tlan_remove_one.patch
queue-4.4/net-moxa-fix-uaf-in-moxart_mac_probe.patch
