Am Dienstag, den 30.07.2019, 02:38 -0700 schrieb syzbot:
Hello,
syzbot found the following crash on:
HEAD commit: 41550654 [UPSTREAM] KVM: x86: degrade WARN to
pr_warn_rate..
git tree: kmsan
console output: https://syzkaller.appspot.com/x/log.txt?x=13e95183a00000
kernel config:
https://syzkaller.appspot.com/x/.config?x=40511ad0c5945201
dashboard link:
https://syzkaller.appspot.com/bug?extid=513e4d0985298538bf9b
compiler: clang version 9.0.0 (/home/glider/llvm/clang
80fee25776c2fb61e74c1ecb1a523375c2500b69)
syz repro:
https://syzkaller.appspot.com/x/repro.syz?x=17eafa1ba00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17b87983a00000
IMPORTANT: if you fix the bug, please add the following tag to the
commit:
Reported-by: syzbot+513e4d0985298538bf9b@xxxxxxxxxxxxxxxxxxxxxxxxx
#syz test: https://github.com/google/kasan.git 41550654
KMSAN bugs can only be tested on https://github.com/google/kmsan.git tree
because KMSAN tool is not upstreamed yet.
See https://goo.gl/tpsmEJ#kmsan-bugs for details.
From 6de76fa3df8aedc7a76dc0ecdea8308e38d4dccc Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Tue, 6 Aug 2019 14:41:52 +0200
Subject: [PATCH] pcan_usb_fd: zero out the common command buffer
Lest we leak kernel memory to a device we better zero out buffers.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
---
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 34761c3a6286..47cc1ff5b88e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -841,7 +841,7 @@ static int pcan_usb_fd_init(struct peak_usb_device
*dev)
goto err_out;
/* allocate command buffer once for all for the interface */
- pdev->cmd_buffer_addr = kmalloc(PCAN_UFD_CMD_BUFFER_SIZE,
+ pdev->cmd_buffer_addr = kzalloc(PCAN_UFD_CMD_BUFFER_SIZE,
GFP_KERNEL);
if (!pdev->cmd_buffer_addr)
goto err_out_1;
--
2.16.4
