From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A669418EFD0; Tue, 20 Aug 2024 11:51:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724154668; cv=none; b=IY8a4WzRHGjXzC1+IiNfNXAnuIVlfkYT1lpOaB2GiV9tywYPvRrKyr6BNbs0pvgVJv3uOlU4H0UxaYFXtL2tY3g49Bwf+4thDTgF0wWZgjOZFo+WayQzdHMdMboZUP0ST0yPJWLdtvGVY18xZRobf3sDwPWJXossOrYr5tH3iMg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724154668; c=relaxed/simple; bh=waxZ9OJeE5s5LYNiM4ohBHt3MmtoTcA2lejAzyyV3Ko=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=cbNH3IFC0tHO+jvT6iATfoZ06ANRUAaumXMR+BmObMxKUFXf0sxzs5P2HaKRAK8MrTqNS+sAxVL3wloPHf4EceOA2rjr5S1cti/iXFl09cAbyVB/yK8ffpYRRkBCHwWiCbyTWaNdZtsQvEyR8L+77ZOEJAC+/VlHFnwMT8nbTxA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sQgveeTh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="sQgveeTh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 06620C4AF10; Tue, 20 Aug 2024 11:51:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1724154668; bh=waxZ9OJeE5s5LYNiM4ohBHt3MmtoTcA2lejAzyyV3Ko=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sQgveeThpT6aa8tqjhhwUCrG6SO8XtUDh/YaCiHgdUgKHbb9JWpxYY91PgA8SU6cj rDWhRedX7Ql4Reo7hpA4OGWU9ts0qQ2Y9pPQ1UbfzA+EsYKnJyWlu+dq5tbjW88QRd T9HQL302dgAv3hsJbStLmGCDPnRbTigWMO36CbLI= Date: Tue, 20 Aug 2024 13:51:05 +0200 From: "gregkh@linuxfoundation.org" To: =?utf-8?B?6IOh6L+e5Yuk?= Cc: "quic_prashk@quicinc.com" , "quic_jjohnson@quicinc.com" , "linux-usb@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "opensource.kernel" , "akpm@linux-foundation.org" , Michael Nazzareno Trimarchi Subject: Re: [PATCH v2] usb: gadget: u_serial: check Null pointer in EP callback Message-ID: <2024082043-erratic-imitation-e21e@gregkh> References: Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Tue, Aug 20, 2024 at 09:29:05AM +0000, 胡连勤 wrote: > From: Lianqin Hu > > Added null pointer check to avoid system crash. > > Unable to handle kernel NULL pointer dereference at > virtual address 00000000000001a8 > pc : gs_read_complete+0x58/0x240 > lr : usb_gadget_giveback_request+0x40/0x160 > sp : ffffffc00f1539c0 > x29: ffffffc00f1539c0 x28: ffffff8002a30000 x27: 0000000000000000 > x26: ffffff8002a30000 x25: 0000000000000000 x24: ffffff8002a30000 > x23: ffffff8002ff9a70 x22: ffffff898e7a7b00 x21: ffffff803c9af9d8 > x20: ffffff898e7a7b00 x19: 00000000000001a8 x18: ffffffc0099fd098 > x17: 0000000000001000 x16: 0000000080000000 x15: 0000000ac1200000 > x14: 0000000000000003 x13: 000000000000d5e8 x12: 0000000355c314ac > x11: 0000000000000015 x10: 0000000000000012 x9 : 0000000000000008 > x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffffff887cd12000 > x5 : 0000000000000002 x4 : ffffffc00f9b07f0 x3 : ffffffc00f1538d0 > x2 : 0000000000000001 x1 : 0000000000000000 x0 : 00000000000001a8 > Call trace: > gs_read_complete+0x58/0x240 > usb_gadget_giveback_request+0x40/0x160 > dwc3_remove_requests+0x170/0x484 > dwc3_ep0_out_start+0xb0/0x1d4 > __dwc3_gadget_start+0x25c/0x720 > kretprobe_trampoline.cfi_jt+0x0/0x8 > kretprobe_trampoline.cfi_jt+0x0/0x8 > udc_bind_to_driver+0x1d8/0x300 > usb_gadget_probe_driver+0xa8/0x1dc > gadget_dev_desc_UDC_store+0x13c/0x188 > configfs_write_iter+0x160/0x1f4 > vfs_write+0x2d0/0x40c > ksys_write+0x7c/0xf0 > __arm64_sys_write+0x20/0x30 > invoke_syscall+0x60/0x150 > el0_svc_common+0x8c/0xf8 > do_el0_svc+0x28/0xa0 > el0_svc+0x24/0x84 > el0t_64_sync_handler+0x88/0xec > el0t_64_sync+0x1b4/0x1b8 > Code: aa1f03e1 aa1303e0 52800022 2a0103e8 (88e87e62) > ---[ end trace 938847327a739172 ]--- > Kernel panic - not syncing: Oops: Fatal exception > > Signed-off-by: Lianqin Hu > --- > v2: > - Optimize code comments > - Delete log printing > --- > drivers/usb/gadget/function/u_serial.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) Any specific reason you ignored my previous review comments?