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Fri, 20 Jul 2018 05:54:12 -0400 (EDT) Date: Fri, 20 Jul 2018 11:54:10 +0200 From: Greg KH To: Paul Menzel Cc: Mathias Nyman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: BUG: KASAN: use-after-free in xhci_trb_virt_to_dma.part.24+0x1c/0x80 Message-ID: <20180720095410.GA11904@kroah.com> References: <95b4bdb2-962f-561e-ac14-79cd44395915@molgen.mpg.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <95b4bdb2-962f-561e-ac14-79cd44395915@molgen.mpg.de> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 20, 2018 at 11:44:49AM +0200, Paul Menzel wrote: > Dear Linux folks, > > > Using Linux 4.18-rc5+ with kmemleak enabled on a MSI B350M MORTAR (MS-7A37) > with an AMD Ryzen 3 2200G, the memory leak below is suspected. > > ``` > $ sudo less /sys/kernel/debug/kmemleak > unreferenced object 0xffff894f8874a2b8 (size 8): > comm "systemd-udevd", pid 119, jiffies 4294893109 (age 908.348s) > hex dump (first 8 bytes): > 34 01 05 00 00 00 00 00 4....... > backtrace: > [<00000000308e4456>] xhci_init+0x81/0x170 [xhci_hcd] > [<00000000269aa18f>] xhci_gen_setup+0x2cb/0x510 [xhci_hcd] > [<000000007b70d85f>] xhci_pci_setup+0x4d/0x120 [xhci_pci] > [<0000000059f49127>] usb_add_hcd+0x2b6/0x800 [usbcore] > [<000000009a16d67c>] usb_hcd_pci_probe+0x1f3/0x460 [usbcore] > [<0000000001295c2e>] xhci_pci_probe+0x27/0x1d7 [xhci_pci] > [<00000000395bd8f9>] local_pci_probe+0x41/0x90 > [<00000000a344e362>] pci_device_probe+0x189/0x1a0 > [<00000000318999e5>] driver_probe_device+0x2b9/0x460 > [<00000000c29d8a55>] __driver_attach+0xdd/0x110 > [<00000000975b7f46>] bus_for_each_dev+0x76/0xc0 > [<000000006bc40955>] bus_add_driver+0x152/0x230 > [<00000000840ed63c>] driver_register+0x6b/0xb0 > [<00000000123908c4>] do_one_initcall+0x46/0x1c3 > [<00000000ce69c793>] do_init_module+0x5a/0x210 > [<0000000091d4aef2>] load_module+0x21c4/0x2410 > […] > ``` That's really vague. Any chance for a reproducer or some other types of hints as to what you feel the problem is here? thanks, greg k-h