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 B22C41EA95 for ; Thu, 12 Oct 2023 14:28:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jcd4XL1k" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C0BCC433C8; Thu, 12 Oct 2023 14:28:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697120890; bh=9NRzGriIdVw7J/qyLb/puVHqGx9a7Bn3c8C+RlHyPJ4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jcd4XL1kHu4ZxukZiedKOO9vymcQSdsub7HU+XzAdVwAHHgHAOktFo5kS0VC6K/sD 7Pz2bGGBSXuz8RRlzkpQbdFFN0Xu4pR5g9EbKkWQikKFsUIa9Qchbk1XuvA8hUUyHW vcrC3QhqN3L7C8E+Bwd5XIZexWkZiZExpL5Sq8FCU8jEHxpuM6inTl9FSh5RofZF8a hIBuT22XFHVvySvFuiNXPjFZSq9wf8d/Uy1RuH3NOU4E2CLABBime600XHUZDMe0XQ xa3NFI9JmOLZzFGALVkO5jbICC3eG2IENFPUWMXni63pQyRpp88VPQGY5w+9cntOf+ SZsz5/QgjpQmQ== Date: Thu, 12 Oct 2023 22:28:00 +0800 From: Peter Chen To: =?utf-8?B?TWljaGHFgiBNaXJvc8WCYXc=?= Cc: Greg Kroah-Hartman , Peter Geis , Thierry Reding , Dmitry Osipenko , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org Subject: Re: [PATCH v2 1/3] usb: chipidea: Fix DMA overwrite for Tegra Message-ID: <20231012142800.GB1010588@nchen-desktop> 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 23-09-28 23:06:03, Michał Mirosław wrote: > Tegra USB controllers seem to issue DMA in full 32-bit words only and thus > may overwrite unevenly-sized buffers. One such occurrence is detected by > SLUB when receiving a reply to a 1-byte buffer (below). Fix this by > allocating a bounce buffer also for buffers with sizes not a multiple of 4. > > ============================================================================= > BUG kmalloc-64 (Tainted: G B ): kmalloc Redzone overwritten > ----------------------------------------------------------------------------- > > 0x8555cd02-0x8555cd03 @offset=3330. First byte 0x0 instead of 0xcc > Allocated in usb_get_status+0x2b/0xac age=1 cpu=3 pid=41 > __kmem_cache_alloc_node+0x12f/0x1e4 > __kmalloc+0x33/0x8c > usb_get_status+0x2b/0xac > hub_probe+0x5e9/0xcec > usb_probe_interface+0xbf/0x21c > really_probe+0xa5/0x2c4 > __driver_probe_device+0x75/0x174 > driver_probe_device+0x31/0x94 > __device_attach_driver+0x65/0xc0 > bus_for_each_drv+0x4b/0x74 > __device_attach+0x69/0x120 > bus_probe_device+0x65/0x6c > device_add+0x48b/0x5f8 > usb_set_configuration+0x37b/0x6b4 > usb_generic_driver_probe+0x37/0x68 > usb_probe_device+0x35/0xb4 > Slab 0xbf622b80 objects=21 used=18 fp=0x8555cdc0 flags=0x800(slab|zone=0) > Object 0x8555cd00 @offset=3328 fp=0x00000000 > > Redzone 8555ccc0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Redzone 8555ccd0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Redzone 8555cce0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Redzone 8555ccf0: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Object 8555cd00: 01 00 00 00 cc cc cc cc cc cc cc cc cc cc cc cc ................ > Object 8555cd10: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Object 8555cd20: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Object 8555cd30: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................ > Redzone 8555cd40: cc cc cc cc .... > Padding 8555cd74: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZ > CPU: 3 PID: 41 Comm: kworker/3:1 Tainted: G B 6.6.0-rc1mq-00118-g59786f827ea1 #1115 > Hardware name: NVIDIA Tegra SoC (Flattened Device Tree) > Workqueue: usb_hub_wq hub_event > [<8010ca28>] (unwind_backtrace) from [<801090a5>] (show_stack+0x11/0x14) > [<801090a5>] (show_stack) from [<805da2fb>] (dump_stack_lvl+0x4d/0x7c) > [<805da2fb>] (dump_stack_lvl) from [<8026464f>] (check_bytes_and_report+0xb3/0xe4) > [<8026464f>] (check_bytes_and_report) from [<802648e1>] (check_object+0x261/0x290) > [<802648e1>] (check_object) from [<802671b1>] (free_to_partial_list+0x105/0x3f8) > [<802671b1>] (free_to_partial_list) from [<80268613>] (__kmem_cache_free+0x103/0x128) > [<80268613>] (__kmem_cache_free) from [<80425a67>] (usb_get_status+0x73/0xac) > [<80425a67>] (usb_get_status) from [<80421b31>] (hub_probe+0x5e9/0xcec) > [<80421b31>] (hub_probe) from [<80428bbb>] (usb_probe_interface+0xbf/0x21c) > [<80428bbb>] (usb_probe_interface) from [<803ee13d>] (really_probe+0xa5/0x2c4) > [<803ee13d>] (really_probe) from [<803ee3d1>] (__driver_probe_device+0x75/0x174) > [<803ee3d1>] (__driver_probe_device) from [<803ee501>] (driver_probe_device+0x31/0x94) > usb 1-1: device descriptor read/8, error -71 > > Fixes: fc53d5279094 ("usb: chipidea: tegra: Support host mode") > Signed-off-by: Michał Mirosław Acked-by: Peter Chen > --- > drivers/usb/chipidea/host.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c > index 08af26b762a2..abddd39d1ff1 100644 > --- a/drivers/usb/chipidea/host.c > +++ b/drivers/usb/chipidea/host.c > @@ -411,12 +411,13 @@ static int ci_hdrc_alloc_dma_aligned_buffer(struct urb *urb, gfp_t mem_flags) > const unsigned int ci_hdrc_usb_dma_align = 32; > size_t kmalloc_size; > > - if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0 || > - !((uintptr_t)urb->transfer_buffer & (ci_hdrc_usb_dma_align - 1))) > + if (urb->num_sgs || urb->sg || urb->transfer_buffer_length == 0) > + return 0; > + if (!((uintptr_t)urb->transfer_buffer & (ci_hdrc_usb_dma_align - 1)) && !(urb->transfer_buffer_length & 3)) > return 0; > > /* Allocate a buffer with enough padding for alignment */ > - kmalloc_size = urb->transfer_buffer_length + > + kmalloc_size = ALIGN(urb->transfer_buffer_length, 4) + > sizeof(struct ci_hdrc_dma_aligned_buffer) + > ci_hdrc_usb_dma_align - 1; > > -- > 2.39.2 > -- Thanks, Peter Chen