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Sun, 26 Jul 2020 06:03:29 -0400 (EDT) Date: Sun, 26 Jul 2020 12:03:28 +0200 From: Greg KH To: syzbot Cc: Markus.Elfring@web.de, UNGLinuxDriver@microchip.com, davem@davemloft.net, dingxiang@cmss.chinamobile.com, hdanton@sina.com, kuba@kernel.org, linus.walleij@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, steve.glendinning@shawell.net, syzkaller-bugs@googlegroups.com Subject: Re: KASAN: use-after-free Read in __smsc95xx_mdio_read Message-ID: <20200726100328.GA1273266@kroah.com> References: <000000000000a376c105a8313901@google.com> <00000000000083581705ab553aab@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00000000000083581705ab553aab@google.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jul 26, 2020 at 02:57:05AM -0700, syzbot wrote: > syzbot suspects this issue was fixed by commit: > > commit 7e23ab72e73bc601b4cf2983382691d9f165c8d1 > Author: Ding Xiang > Date: Mon Mar 30 07:56:26 2020 +0000 > > pinctrl: nomadik:remove unneeded variable > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13cfe3a0900000 > start commit: 7ae77150 Merge tag 'powerpc-5.8-1' of git://git.kernel.org.. > git tree: upstream > kernel config: https://syzkaller.appspot.com/x/.config?x=d195fe572fb15312 > dashboard link: https://syzkaller.appspot.com/bug?extid=a7ebdb01bb2cc165cab6 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17046c66100000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=140a8a3e100000 > > If the result looks correct, please mark the issue as fixed by replying with: I think the bisection logic needs to be worked on a bit better, as how can this patch resolve the reported problem? thanks, greg k-h