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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>
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1 changed files with 9 additions and 1 deletions
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@ -73,6 +73,10 @@ static int __init init(void)
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cleanup:
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list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
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list_del(&udc_dev->dev_entry);
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/*
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* Just do platform_device_del() here, put_vudc_device()
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* calls the platform_device_put()
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*/
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platform_device_del(udc_dev->pdev);
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put_vudc_device(udc_dev);
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}
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@ -89,7 +93,11 @@ static void __exit cleanup(void)
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list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {
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list_del(&udc_dev->dev_entry);
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platform_device_unregister(udc_dev->pdev);
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/*
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* Just do platform_device_del() here, put_vudc_device()
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* calls the platform_device_put()
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*/
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platform_device_del(udc_dev->pdev);
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put_vudc_device(udc_dev);
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}
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platform_driver_unregister(&vudc_driver);
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