| Message ID | 8966e3b514edf39857dd93603fc79ec02e000a75.1640117288.git.paskripkin@gmail.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2,1/2] asix: fix uninit-value in asix_mdio_read() | expand |
Hello: This series was applied to netdev/net.git (master) by Jakub Kicinski <kuba@kernel.org>: On Tue, 21 Dec 2021 23:10:36 +0300 you 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 > > [...] Here is the summary with links: - [v2,1/2] asix: fix uninit-value in asix_mdio_read() https://git.kernel.org/netdev/net/c/8035b1a2a37a - [v2,2/2] asix: fix wrong return value in asix_check_host_enable() https://git.kernel.org/netdev/net/c/d1652b70d07c You are awesome, thank you!
diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c index 42ba4af68090..06823d7141b6 100644 --- a/drivers/net/usb/asix_common.c +++ b/drivers/net/usb/asix_common.c @@ -77,7 +77,7 @@ static int asix_check_host_enable(struct usbnet *dev, int in_pm) 0, 0, 1, &smsr, in_pm); if (ret == -ENODEV) break; - else if (ret < 0) + else if (ret < sizeof(smsr)) continue; else if (smsr & AX_HOST_EN) break;
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@syzkaller.appspotmail.com Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Pavel Skripkin <paskripkin@gmail.com> --- Changes in v2: - Added Reviewed-by tag --- drivers/net/usb/asix_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)