* [syzbot] KMSAN: uninit-value in asix_mdio_read (3)
@ 2022-03-13 7:35 syzbot
2022-03-13 17:42 ` Pavel Skripkin
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2022-03-13 7:35 UTC (permalink / raw)
To: andrew, davem, glider, kuba, linux-kernel, linux-usb, linux,
netdev, paskripkin, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 724946410067 x86: kmsan: enable KMSAN builds for x86
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=158dd1f6700000
kernel config: https://syzkaller.appspot.com/x/.config?x=28718f555f258365
dashboard link: https://syzkaller.appspot.com/bug?extid=9ed16c369e0f40e366b2
compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b31281700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e8c4ee700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9ed16c369e0f40e366b2@syzkaller.appspotmail.com
asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to enable software MII access
asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
=====================================================
BUG: KMSAN: uninit-value in asix_check_host_enable drivers/net/usb/asix_common.c:84 [inline]
BUG: KMSAN: uninit-value in asix_mdio_read+0x537/0xa40 drivers/net/usb/asix_common.c:499
asix_check_host_enable drivers/net/usb/asix_common.c:84 [inline]
asix_mdio_read+0x537/0xa40 drivers/net/usb/asix_common.c:499
asix_mdio_bus_read+0xba/0xe0 drivers/net/usb/asix_common.c:558
__mdiobus_read+0xbf/0x4f0 drivers/net/phy/mdio_bus.c:762
mdiobus_read+0xaa/0xf0 drivers/net/phy/mdio_bus.c:869
get_phy_c22_id drivers/net/phy/phy_device.c:813 [inline]
get_phy_device+0x218/0x8b0 drivers/net/phy/phy_device.c:890
mdiobus_scan+0x1c7/0x940
__mdiobus_register+0xe6c/0x11a0 drivers/net/phy/mdio_bus.c:589
__devm_mdiobus_register+0x18f/0x2f0 drivers/net/phy/mdio_devres.c:87
ax88772_init_mdio drivers/net/usb/asix_devices.c:676 [inline]
ax88772_bind+0x10b1/0x1770 drivers/net/usb/asix_devices.c:786
usbnet_probe+0x1251/0x4160 drivers/net/usb/usbnet.c:1747
usb_probe_interface+0xf19/0x1600 drivers/usb/core/driver.c:396
really_probe+0x653/0x14b0 drivers/base/dd.c:596
__driver_probe_device+0x3e9/0x530 drivers/base/dd.c:752
driver_probe_device drivers/base/dd.c:782 [inline]
__device_attach_driver+0x79f/0x1120 drivers/base/dd.c:899
bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427
__device_attach+0x593/0x8e0 drivers/base/dd.c:970
device_initial_probe+0x4a/0x60 drivers/base/dd.c:1017
bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
device_add+0x1fff/0x26e0 drivers/base/core.c:3405
usb_set_configuration+0x37e9/0x3ed0 drivers/usb/core/message.c:2170
usb_generic_driver_probe+0x13c/0x300 drivers/usb/core/generic.c:238
usb_probe_device+0x309/0x570 drivers/usb/core/driver.c:293
really_probe+0x653/0x14b0 drivers/base/dd.c:596
__driver_probe_device+0x3e9/0x530 drivers/base/dd.c:752
driver_probe_device drivers/base/dd.c:782 [inline]
__device_attach_driver+0x79f/0x1120 drivers/base/dd.c:899
bus_for_each_drv+0x2d6/0x3f0 drivers/base/bus.c:427
__device_attach+0x593/0x8e0 drivers/base/dd.c:970
device_initial_probe+0x4a/0x60 drivers/base/dd.c:1017
bus_probe_device+0x17b/0x3e0 drivers/base/bus.c:487
device_add+0x1fff/0x26e0 drivers/base/core.c:3405
usb_new_device+0x1b8e/0x2950 drivers/usb/core/hub.c:2566
hub_port_connect drivers/usb/core/hub.c:5358 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
port_event drivers/usb/core/hub.c:5660 [inline]
hub_event+0x58e3/0x89e0 drivers/usb/core/hub.c:5742
process_one_work+0xdb6/0x1820 kernel/workqueue.c:2307
worker_thread+0x10b3/0x21e0 kernel/workqueue.c:2454
kthread+0x3c7/0x500 kernel/kthread.c:377
ret_from_fork+0x1f/0x30
Local variable smsr.i created at:
asix_mdio_read+0xaf/0xa40 drivers/net/usb/asix_common.c:499
asix_mdio_bus_read+0xba/0xe0 drivers/net/usb/asix_common.c:558
CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] KMSAN: uninit-value in asix_mdio_read (3)
2022-03-13 7:35 [syzbot] KMSAN: uninit-value in asix_mdio_read (3) syzbot
@ 2022-03-13 17:42 ` Pavel Skripkin
2022-03-13 17:57 ` syzbot
0 siblings, 1 reply; 4+ messages in thread
From: Pavel Skripkin @ 2022-03-13 17:42 UTC (permalink / raw)
To: syzbot, andrew, davem, glider, kuba, linux-kernel, linux-usb,
linux, netdev, syzkaller-bugs
[-- Attachment #1: Type: text/plain, Size: 965 bytes --]
On 3/13/22 10:35, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 724946410067 x86: kmsan: enable KMSAN builds for x86
> git tree: https://github.com/google/kmsan.git master
> console output: https://syzkaller.appspot.com/x/log.txt?x=158dd1f6700000
> kernel config: https://syzkaller.appspot.com/x/.config?x=28718f555f258365
> dashboard link: https://syzkaller.appspot.com/bug?extid=9ed16c369e0f40e366b2
> compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b31281700000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e8c4ee700000
>
Hm, we have closed the same bug with my patch from -next tree. Let's
check if it really fixes the problem...
#syz test: https://github.com/google/kmsan.git master
With regards,
Pavel Skripkin
[-- Attachment #2: 0001-net-asix-add-proper-error-handling-of-usb-read-error.patch --]
[-- Type: text/x-patch, Size: 5107 bytes --]
From 2e250fc010a2883961784261474a8fb26c10b68c Mon Sep 17 00:00:00 2001
From: Pavel Skripkin <paskripkin@gmail.com>
Date: Sun, 6 Feb 2022 21:05:16 +0300
Subject: [PATCH] net: asix: add proper error handling of usb read errors
Syzbot once again hit uninit value in asix driver. The problem still the
same -- asix_read_cmd() reads less bytes, than was requested by caller.
Since all read requests are performed via asix_read_cmd() let's catch
usb related error there and add __must_check notation to be sure all
callers actually check return value.
So, this patch adds sanity check inside asix_read_cmd(), that simply
checks if bytes read are not less, than was requested and adds missing
error handling of asix_read_cmd() all across the driver code.
Fixes: d9fe64e51114 ("net: asix: Add in_pm parameter")
Reported-and-tested-by: syzbot+6ca9f7867b77c2d316ac@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Tested-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/usb/asix.h | 4 ++--
drivers/net/usb/asix_common.c | 19 +++++++++++++------
drivers/net/usb/asix_devices.c | 21 ++++++++++++++++++---
3 files changed, 33 insertions(+), 11 deletions(-)
diff --git a/drivers/net/usb/asix.h b/drivers/net/usb/asix.h
index 2a1e31defe71..4334aafab59a 100644
--- a/drivers/net/usb/asix.h
+++ b/drivers/net/usb/asix.h
@@ -192,8 +192,8 @@ extern const struct driver_info ax88172a_info;
/* ASIX specific flags */
#define FLAG_EEPROM_MAC (1UL << 0) /* init device MAC from eeprom */
-int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
- u16 size, void *data, int in_pm);
+int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
+ u16 size, void *data, int in_pm);
int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
u16 size, void *data, int in_pm);
diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
index 71682970be58..524805285019 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -11,8 +11,8 @@
#define AX_HOST_EN_RETRIES 30
-int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
- u16 size, void *data, int in_pm)
+int __must_check asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
+ u16 size, void *data, int in_pm)
{
int ret;
int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
@@ -27,9 +27,12 @@ int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
ret = fn(dev, cmd, USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
value, index, data, size);
- if (unlikely(ret < 0))
+ if (unlikely(ret < size)) {
+ ret = ret < 0 ? ret : -ENODATA;
+
netdev_warn(dev->net, "Failed to read reg index 0x%04x: %d\n",
index, ret);
+ }
return ret;
}
@@ -79,7 +82,7 @@ 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 < sizeof(smsr))
+ else if (ret < 0)
continue;
else if (smsr & AX_HOST_EN)
break;
@@ -579,8 +582,12 @@ int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
return ret;
}
- asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
- (__u16)loc, 2, &res, 1);
+ ret = asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
+ (__u16)loc, 2, &res, 1);
+ if (ret < 0) {
+ mutex_unlock(&dev->phy_mutex);
+ return ret;
+ }
asix_set_hw_mii(dev, 1);
mutex_unlock(&dev->phy_mutex);
diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 4514d35ef4c4..6b2fbdf4e0fd 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -755,7 +755,12 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
priv->phy_addr = ret;
priv->embd_phy = ((priv->phy_addr & 0x1f) == 0x10);
- asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &chipcode, 0);
+ ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &chipcode, 0);
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read STATMNGSTS_REG: %d\n", ret);
+ return ret;
+ }
+
chipcode &= AX_CHIPCODE_MASK;
ret = (chipcode == AX_AX88772_CHIPCODE) ? ax88772_hw_reset(dev, 0) :
@@ -920,11 +925,21 @@ static int ax88178_reset(struct usbnet *dev)
int gpio0 = 0;
u32 phyid;
- asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &status, 0);
+ ret = asix_read_cmd(dev, AX_CMD_READ_GPIOS, 0, 0, 1, &status, 0);
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read GPIOS: %d\n", ret);
+ return ret;
+ }
+
netdev_dbg(dev->net, "GPIO Status: 0x%04x\n", status);
asix_write_cmd(dev, AX_CMD_WRITE_ENABLE, 0, 0, 0, NULL, 0);
- asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, &eeprom, 0);
+ ret = asix_read_cmd(dev, AX_CMD_READ_EEPROM, 0x0017, 0, 2, &eeprom, 0);
+ if (ret < 0) {
+ netdev_dbg(dev->net, "Failed to read EEPROM: %d\n", ret);
+ return ret;
+ }
+
asix_write_cmd(dev, AX_CMD_WRITE_DISABLE, 0, 0, 0, NULL, 0);
netdev_dbg(dev->net, "EEPROM index 0x17 is 0x%04x\n", eeprom);
--
2.35.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [syzbot] KMSAN: uninit-value in asix_mdio_read (3)
2022-03-13 17:42 ` Pavel Skripkin
@ 2022-03-13 17:57 ` syzbot
2022-03-13 17:58 ` Pavel Skripkin
0 siblings, 1 reply; 4+ messages in thread
From: syzbot @ 2022-03-13 17:57 UTC (permalink / raw)
To: andrew, davem, glider, kuba, linux-kernel, linux-usb, linux,
netdev, paskripkin, syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-and-tested-by: syzbot+9ed16c369e0f40e366b2@syzkaller.appspotmail.com
Tested on:
commit: 72494641 x86: kmsan: enable KMSAN builds for x86
git tree: https://github.com/google/kmsan.git master
kernel config: https://syzkaller.appspot.com/x/.config?x=28718f555f258365
dashboard link: https://syzkaller.appspot.com/bug?extid=9ed16c369e0f40e366b2
compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=11ccaa41700000
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [syzbot] KMSAN: uninit-value in asix_mdio_read (3)
2022-03-13 17:57 ` syzbot
@ 2022-03-13 17:58 ` Pavel Skripkin
0 siblings, 0 replies; 4+ messages in thread
From: Pavel Skripkin @ 2022-03-13 17:58 UTC (permalink / raw)
To: syzbot, andrew, davem, glider, kuba, linux-kernel, linux-usb,
linux, netdev, syzkaller-bugs
On 3/13/22 20:57, syzbot wrote:
> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-and-tested-by: syzbot+9ed16c369e0f40e366b2@syzkaller.appspotmail.com
>
> Tested on:
>
> commit: 72494641 x86: kmsan: enable KMSAN builds for x86
> git tree: https://github.com/google/kmsan.git master
> kernel config: https://syzkaller.appspot.com/x/.config?x=28718f555f258365
> dashboard link: https://syzkaller.appspot.com/bug?extid=9ed16c369e0f40e366b2
> compiler: clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
> patch: https://syzkaller.appspot.com/x/patch.diff?x=11ccaa41700000
>
> Note: testing is done by a robot and is best-effort only.
#syz fix: net: asix: add proper error handling of usb read errors
With regards,
Pavel Skripkin
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-03-13 17:58 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-03-13 7:35 [syzbot] KMSAN: uninit-value in asix_mdio_read (3) syzbot
2022-03-13 17:42 ` Pavel Skripkin
2022-03-13 17:57 ` syzbot
2022-03-13 17:58 ` Pavel Skripkin
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