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Thu, 16 Jul 2020 11:55:45 +0000 (GMT) From: Marek Szyprowski To: linux-usb@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Marek Szyprowski , Felipe Balbi , Minas Harutyunyan , Bartlomiej Zolnierkiewicz , Greg Kroah-Hartman Subject: [PATCH] usb: gadget: udc: Flush pending work also in error path Date: Thu, 16 Jul 2020 13:55:25 +0200 Message-Id: <20200716115525.27519-1-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrAIsWRmVeSWpSXmKPExsWy7djP87rODgLxBl++8VpsnLGe1eJY2xN2 i+bF69ksGn/tZbe4vGsOm8WiZa3MFmuP3GV3YPfYtKqTzWP/3DXsHn1bVjF6bNn/mdHj8ya5 ANYoLpuU1JzMstQifbsErow3fw+xFTwUqpj4cipzA2OjQBcjJ4eEgIlE/8N29i5GLg4hgRWM EhfX3WCFcL4wSrz5dwsq85lRYvmju0wwLdumz2SESCxnlLhw8iwzXMvF22cZQarYBAwlut52 sYHYIgKyEoev/AYrYhZoYZK48O0zO0hCWMBD4tqvj6wgNouAqsTVlofMIDavgK3E2j+dbBDr 5CVWbzgA1iwhcJ1NYvXVJ1B3uEi8fXgAqkhY4tXxLewQtozE6ck9LBANzYwSD8+tZYdwehgl LjfNYISospa4c+4XUDcH0E2aEut36UOEHSWm3OgDC0sI8EnceCsIEmYGMidtm84MEeaV6GgT gqhWk5h1fB3c2oMXLkGVeEg0/ckBCQsJxEosufOAeQKj3CyEVQsYGVcxiqeWFuempxYb5aWW 6xUn5haX5qXrJefnbmIEpoPT/45/2cG460/SIUYBDkYlHl6Fn3zxQqyJZcWVuYcYJTiYlUR4 nc6ejhPiTUmsrEotyo8vKs1JLT7EKM3BoiTOa7zoZayQQHpiSWp2ampBahFMlomDU6qBUc96 luWf0vxpN3a2L1CXUn94Zl1clWvqEnG/6wr8nBtPH9dWWNi/y+S7bdT3P48O8u1xuRAYrbq2 t2pJS/KBXQm5/1zuLnu/4Fbw6VrG8wneH3tn7nC+9eIpY/7ZmZ9j9VK/Wii9PPWnS9lr+Zkj PaXxy5iWc389qff5ckympcjOXAeBeoMpSUosxRmJhlrMRcWJAGjUnBIDAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrKLMWRmVeSWpSXmKPExsVy+t/xu7pODgLxBm3drBYbZ6xntTjW9oTd onnxejaLxl972S0u75rDZrFoWSuzxdojd9kd2D02repk89g/dw27R9+WVYweW/Z/ZvT4vEku gDVKz6Yov7QkVSEjv7jEVina0MJIz9DSQs/IxFLP0Ng81srIVEnfziYlNSezLLVI3y5BL+PN 30NsBQ+FKia+nMrcwNgo0MXIySEhYCKxbfpMRhBbSGApo8Sut1kQcRmJk9MaWCFsYYk/17rY uhi5gGo+AdXcnscGkmATMJToetsFZosIyEocvvKbGaSIWaCDSaL18SxmkISwgIfEtV8fwSax CKhKXG15CBbnFbCVWPunkw1ig7zE6g0HmCcw8ixgZFjFKJJaWpybnltspFecmFtcmpeul5yf u4kRGITbjv3csoOx613wIUYBDkYlHl6Fn3zxQqyJZcWVuYcYJTiYlUR4nc6ejhPiTUmsrEot yo8vKs1JLT7EaAq0fCKzlGhyPjBC8kriDU0NzS0sDc2NzY3NLJTEeTsEDsYICaQnlqRmp6YW pBbB9DFxcEo1MJZteVus8f+3SGzRiante4XrWRaujw0wCjx49Z72xTSr93wVqirX+VkuLv0g 1LZ36g0nab8/ditKc348cq7wORJr+SNH8PuHO5NuTjc8cFjTcE92800hvXkq7XcmbZA6HKZ+ eee8X9N/PXrivenUjW7XpXbNs7bLtTvdn7Z0Q12Nys7WjjVH/hxUYinOSDTUYi4qTgQACLO1 F1gCAAA= X-CMS-MailID: 20200716115546eucas1p1deb159dd37bc1211f4579d4d85f9af92 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200716115546eucas1p1deb159dd37bc1211f4579d4d85f9af92 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200716115546eucas1p1deb159dd37bc1211f4579d4d85f9af92 References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When binding an UDC driver to the pending gadget fails in check_pending_gadget_drivers(), the usb_add_gadget_udc_release() function ends without waiting for the usb_gadget_state_work to finish, what in turn might cause the whole struct usb_gadget being freed by the caller before the usb_gadget_state_work being executed. This can be observed on some boards with USB Mass Storage gadget compiled-in and kernel booted without the needed module parameters: dwc2 12480000.hsotg: dwc2_check_params: Invalid parameter besl=1 dwc2 12480000.hsotg: dwc2_check_params: Invalid parameter g_np_tx_fifo_size=1024 dwc2 12480000.hsotg: EPs: 16, dedicated fifos, 7808 entries in SPRAM Mass Storage Function, version: 2009/09/11 LUN: removable file: (no medium) no file given for LUN0 g_mass_storage 12480000.hsotg: failed to start g_mass_storage: -22 dwc2: probe of 12480000.hsotg failed with error -22 8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000004 pgd = (ptrval) [00000004] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 88 Comm: kworker/1:2 Not tainted 5.8.0-rc5-next-20200715-00062-gc5bb489ae825-dirty #8792 Hardware name: Samsung Exynos (Flattened Device Tree) Workqueue: 0x0 (rcu_gp) PC is at process_one_work+0x44/0x7dc ... Process kworker/1:2 (pid: 88, stack limit = 0x(ptrval)) Stack: (0xed9f1f00 to 0xed9f2000) ... [] (process_one_work) from [] (worker_thread+0x44/0x51c) [] (worker_thread) from [] (kthread+0x158/0x1a0) [] (kthread) from [] (ret_from_fork+0x14/0x20) Exception stack(0xed9f1fb0 to 0xed9f1ff8) ... ---[ end trace 5033c1326a62e5f3 ]--- note: kworker/1:2[88] exited with preempt_count 1 Fix this by flushing pending work in error path. Signed-off-by: Marek Szyprowski --- drivers/usb/gadget/udc/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index c33ad8a333ad..4f82bcd31fd3 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -1230,6 +1230,7 @@ int usb_add_gadget_udc_release(struct device *parent, struct usb_gadget *gadget, return 0; err_del_udc: + flush_work(&gadget->work); device_del(&udc->dev); err_unlist_udc: -- 2.17.1