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Received: from willy by casper.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1rQSyq-00000002KSu-437J; Thu, 18 Jan 2024 14:02:52 +0000 Date: Thu, 18 Jan 2024 14:02:52 +0000 From: Matthew Wilcox To: Dmitry Vyukov Cc: syzbot , wzhmmmmm@gmail.com, johan.hedberg@gmail.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, marcel@holtmann.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [bluetooth?] KASAN: null-ptr-deref Read in ida_free (4) Message-ID: References: <000000000000a135c0060a2260b3@google.com> <00000000000037f0f3060af9e763@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Jan 18, 2024 at 11:21:34AM +0100, Dmitry Vyukov wrote: > On Sat, 25 Nov 2023 at 14:18, syzbot > wrote: > > > > syzbot has found a reproducer for the following issue on: > > > > HEAD commit: 8c9660f65153 Add linux-next specific files for 20231124 > > git tree: linux-next > > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1678a3cce80000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=ca1e8655505e280 > > dashboard link: https://syzkaller.appspot.com/bug?extid=51baee846ddab52d5230 > > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10d54c08e80000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160ef1a4e80000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/345ed4af3a0d/disk-8c9660f6.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/191053c69d57/vmlinux-8c9660f6.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/aac7ee5e55e0/bzImage-8c9660f6.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+51baee846ddab52d5230@syzkaller.appspotmail.com > > > > Bluetooth: hci0: hardware error 0x00 > > ================================================================== > > BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] > > BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] > > BUG: KASAN: null-ptr-deref in ida_free+0x218/0x2e0 lib/idr.c:511 > > Read of size 8 at addr 0000000000000078 by task kworker/u5:1/4455 > > > > CPU: 1 PID: 4455 Comm: kworker/u5:1 Not tainted 6.7.0-rc2-next-20231124-syzkaller #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 > > Workqueue: hci0 hci_error_reset > > Call Trace: > > > > __dump_stack lib/dump_stack.c:88 [inline] > > dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 > > kasan_report+0xd9/0x110 mm/kasan/report.c:588 > > check_region_inline mm/kasan/generic.c:182 [inline] > > kasan_check_range+0xef/0x190 mm/kasan/generic.c:188 > > instrument_atomic_read include/linux/instrumented.h:68 [inline] > > _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] > > Wonder if this is fixed with: > > ida: Fix crash in ida_free when the bitmap is empty > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af73483f4e8b6f5c68c9aa63257bdd929a9c194a > > ? Should be. The backtrace below looks like it's the same bug that got reported 3-4 weeks ago. > > ida_free+0x218/0x2e0 lib/idr.c:511 > > hci_conn_cleanup net/bluetooth/hci_conn.c:157 [inline] > > hci_conn_del+0x78c/0xe10 net/bluetooth/hci_conn.c:1183 > > hci_conn_hash_flush+0x189/0x260 net/bluetooth/hci_conn.c:2643 > > hci_dev_close_sync+0x5a7/0x1160 net/bluetooth/hci_sync.c:5021 > > hci_dev_do_close+0x2e/0x90 net/bluetooth/hci_core.c:554 > > hci_error_reset+0xa6/0x190 net/bluetooth/hci_core.c:1059 > > process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633 > > process_scheduled_works kernel/workqueue.c:2706 [inline] > > worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787 > > kthread+0x2c1/0x3a0 kernel/kthread.c:389 > > ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 > > ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 > > > > ================================================================== > > > > > > --- > > If you want syzbot to run the reproducer, reply with: > > #syz test: git://repo/address.git branch-or-commit-hash > > If you attach or paste a git patch, syzbot will apply it before testing. > > > > -- > > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com. > > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/00000000000037f0f3060af9e763%40google.com.