net: macb: fix use after free on rmmod
authorTong Zhang <ztong0001@gmail.com>
Wed, 8 Sep 2021 19:02:32 +0000 (12:02 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 30 Sep 2021 08:11:05 +0000 (10:11 +0200)
commit7721221e87d25c9840d9ca6b986dbdc410d5ce2b
tree9c38aa71e9bac5f21ffa39527583e96c604e6d69
parenta632288053b7a00e08f12ea69507bc07922331c8
net: macb: fix use after free on rmmod

[ Upstream commit d82d5303c4c539db86588ffb5dc5b26c3f1513e8 ]

plat_dev->dev->platform_data is released by platform_device_unregister(),
use of pclk and hclk is a use-after-free. Since device unregister won't
need a clk device we adjust the function call sequence to fix this issue.

[   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
[   31.275563] Freed by task 306:
[   30.276782]  platform_device_release+0x25/0x80

Suggested-by: Nicolas Ferre <Nicolas.Ferre@microchip.com>
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/net/ethernet/cadence/macb_pci.c