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[Qemu-devel] [PATCH] usb: initialize libusb_device to avoid crash
From: |
Jincheng Miao |
Subject: |
[Qemu-devel] [PATCH] usb: initialize libusb_device to avoid crash |
Date: |
Fri, 20 Jun 2014 14:12:52 +0800 |
If libusb_get_device_list() fails, the uninitialized local variable
libusb_device would be passed to libusb_free_device_list(), that
will cause a crash, like:
(gdb) bt
#0 0x00007fbbb4bafc10 in pthread_mutex_lock () from /lib64/libpthread.so.0
#1 0x00007fbbb233e653 in libusb_unref_device (dev=0x6275682d627375)
at core.c:902
#2 0x00007fbbb233e739 in libusb_free_device_list (list=0x7fbbb6e8436e,
unref_devices=<optimized out>) at core.c:653
#3 0x00007fbbb6cd80a4 in usb_host_auto_check (address@hidden)
at hw/usb/host-libusb.c:1446
#4 0x00007fbbb6cd8525 in usb_host_initfn (udev=0x7fbbbd3c5670)
at hw/usb/host-libusb.c:912
#5 0x00007fbbb6cc123b in usb_device_init (dev=0x7fbbbd3c5670)
at hw/usb/bus.c:106
...
So initialize libusb_device at the begin time.
Signed-off-by: Jincheng Miao <address@hidden>
---
hw/usb/host-libusb.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
index 33b5b9f..c189147 100644
--- a/hw/usb/host-libusb.c
+++ b/hw/usb/host-libusb.c
@@ -1522,7 +1522,7 @@ static void usb_host_auto_check(void *unused)
{
struct USBHostDevice *s;
struct USBAutoFilter *f;
- libusb_device **devs;
+ libusb_device **devs = NULL;
struct libusb_device_descriptor ddesc;
int unconnected = 0;
int i, n;
@@ -1623,7 +1623,7 @@ static void usb_host_auto_check(void *unused)
void usb_host_info(Monitor *mon, const QDict *qdict)
{
- libusb_device **devs;
+ libusb_device **devs = NULL;
struct libusb_device_descriptor ddesc;
char port[16];
int i, n;
--
1.7.1
- [Qemu-devel] [PATCH] usb: initialize libusb_device to avoid crash,
Jincheng Miao <=