Re: [PATCH 1/2] asix: fix uninit-value in asix_mdio_read()

[Andrew Lunn]

On Tue, Dec 21, 2021 at 10:39:32PM +0300, Pavel Skripkin wrote:
> asix_read_cmd() may read less than sizeof(smsr) bytes and in this case
> smsr will be uninitialized.
> 
> Fail log:
> BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline]
> BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline] drivers/net/usb/asix_common.c:497
> BUG: KMSAN: uninit-value in asix_mdio_read+0x3c1/0xb00 drivers/net/usb/asix_common.c:497 drivers/net/usb/asix_common.c:497
>  asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline]
>  asix_check_host_enable drivers/net/usb/asix_common.c:82 [inline] drivers/net/usb/asix_common.c:497
>  asix_mdio_read+0x3c1/0xb00 drivers/net/usb/asix_common.c:497 drivers/net/usb/asix_common.c:497
> 
> Fixes: d9fe64e51114 ("net: asix: Add in_pm parameter")
> Reported-and-tested-by: syzbot+f44badb06036334e867a@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Pavel Skripkin <paskripkin@xxxxxxxxx>

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew