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authorShuah Khan (Samsung OSG) <shuah@kernel.org>2018-10-18 10:19:29 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-10-18 19:44:39 +0200
commite28fd56ad5273be67d0fae5bedc7e1680e729952 (patch)
tree76d02d9e61603277f2ef1ac3d421f1b1166b0fa3 /drivers
parente325808c0051b16729ffd472ff887c6cae5c6317 (diff)
downloadlinux-e28fd56ad5273be67d0fae5bedc7e1680e729952.tar.bz2
usbip:vudc: BUG kmalloc-2048 (Not tainted): Poison overwritten
In rmmod path, usbip_vudc does platform_device_put() twice once from platform_device_unregister() and then from put_vudc_device(). The second put results in: BUG kmalloc-2048 (Not tainted): Poison overwritten error or BUG: KASAN: use-after-free in kobject_put+0x1e/0x230 if KASAN is enabled. [ 169.042156] calling init+0x0/0x1000 [usbip_vudc] @ 1697 [ 169.042396] ============================================================================= [ 169.043678] probe of usbip-vudc.0 returned 1 after 350 usecs [ 169.044508] BUG kmalloc-2048 (Not tainted): Poison overwritten [ 169.044509] ----------------------------------------------------------------------------- ... [ 169.057849] INFO: Freed in device_release+0x2b/0x80 age=4223 cpu=3 pid=1693 [ 169.057852] kobject_put+0x86/0x1b0 [ 169.057853] 0xffffffffc0c30a96 [ 169.057855] __x64_sys_delete_module+0x157/0x240 Fix it to call platform_device_del() instead and let put_vudc_device() do the platform_device_put(). Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org> Cc: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/usbip/vudc_main.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/usb/usbip/vudc_main.c b/drivers/usb/usbip/vudc_main.c
index 3fc22037a82f..390733e6937e 100644
--- a/drivers/usb/usbip/vudc_main.c
+++ b/drivers/usb/usbip/vudc_main.c
@@ -73,6 +73,10 @@ static int __init init(void)
cleanup:
list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
list_del(&udc_dev->dev_entry);
+ /*
+ * Just do platform_device_del() here, put_vudc_device()
+ * calls the platform_device_put()
+ */
platform_device_del(udc_dev->pdev);
put_vudc_device(udc_dev);
}
@@ -89,7 +93,11 @@ static void __exit cleanup(void)
list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
list_del(&udc_dev->dev_entry);
- platform_device_unregister(udc_dev->pdev);
+ /*
+ * Just do platform_device_del() here, put_vudc_device()
+ * calls the platform_device_put()
+ */
+ platform_device_del(udc_dev->pdev);
put_vudc_device(udc_dev);
}
platform_driver_unregister(&vudc_driver);