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[213.220.235.50]) by smtp.gmail.com with ESMTPSA id q15sm31743144wrg.65.2019.10.07.07.42.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Oct 2019 07:42:46 -0700 (PDT) Date: Mon, 7 Oct 2019 16:42:45 +0200 From: Jiri Pirko To: syzbot Cc: alex.aring@gmail.com, davem@davemloft.net, jiri@mellanox.com, linux-kernel@vger.kernel.org, linux-wpan@vger.kernel.org, netdev@vger.kernel.org, stefan@datenfreihafen.org, syzkaller-bugs@googlegroups.com Subject: Re: KASAN: use-after-free Read in __cfg8NUM_wpan_dev_from_attrs Message-ID: <20191007144245.GC2326@nanopsycho> References: <00000000000035a04b059452bc21@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <00000000000035a04b059452bc21@google.com> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org Mon, Oct 07, 2019 at 04:19:09PM CEST, syzbot+9cb7edb2906ea1e83006@syzkaller.appspotmail.com wrote: >Hello, > >syzbot found the following crash on: > >HEAD commit: 056ddc38 Merge branch 'stmmac-next' >git tree: net-next >console output: https://syzkaller.appspot.com/x/log.txt?x=125aaafd600000 >kernel config: https://syzkaller.appspot.com/x/.config?x=d9be300620399522 >dashboard link: https://syzkaller.appspot.com/bug?extid=9cb7edb2906ea1e83006 >compiler: gcc (GCC) 9.0.0 20181231 (experimental) >syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1232bb3f600000 >C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162d0d0b600000 > >The bug was bisected to: > >commit 75cdbdd089003cd53560ff87b690ae911fa7df8e >Author: Jiri Pirko >Date: Sat Oct 5 18:04:37 2019 +0000 > > net: ieee802154: have genetlink code to parse the attrs during dumpit > >bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11be5d0b600000 >final crash: https://syzkaller.appspot.com/x/report.txt?x=13be5d0b600000 >console output: https://syzkaller.appspot.com/x/log.txt?x=15be5d0b600000 > >IMPORTANT: if you fix the bug, please add the following tag to the commit: >Reported-by: syzbot+9cb7edb2906ea1e83006@syzkaller.appspotmail.com >Fixes: 75cdbdd08900 ("net: ieee802154: have genetlink code to parse the attrs >during dumpit") > >netlink: 'syz-executor134': attribute type 6 has an invalid length. >================================================================== >BUG: KASAN: use-after-free in nla_memcpy+0xa2/0xb0 lib/nlattr.c:572 I'm on this.