From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_DIGITS, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B2CDCC7618B for ; Tue, 23 Jul 2019 08:49:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7AE91223A1 for ; Tue, 23 Jul 2019 08:49:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731847AbfGWItH (ORCPT ); Tue, 23 Jul 2019 04:49:07 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:36482 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727994AbfGWItG (ORCPT ); Tue, 23 Jul 2019 04:49:06 -0400 Received: by mail-io1-f71.google.com with SMTP id k21so46472815ioj.3 for ; Tue, 23 Jul 2019 01:49:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=zK84h6QU5epES3W4KTjWKMKe3m3wTviU6kKTu275Q48=; b=s2wZBdrSrpgKJaANNKUI1ve17SAPt3uQcsYEvleVYKiRMx2QDR7xiKwI83lTAVdfDD RkxQ4yB0SQ2DjqmxvuVZCoHNIiC+OKRRQI0Z/OKff3XwlAIWFXgz8GZrAluLLVEdL0Oj dqvu5KLl1EGYr2763HLX7yNs2UrUovdV5I6tZdulUNWIHNxy4sELIgoWgnw6nTQE63HR 5MWObL42MQ3do5vfJDaqhjWnw2QkaZ7UuZSr1ziR9ia8CIiK1UixHAB7AKw1o05mBCJf NiSz0HxYuUqR2YmNQ8n1wQjElRy2hd9bUxCefkmdzhClx8TUDza0EIz9MHE7LL2gOtjv ZKqQ== X-Gm-Message-State: APjAAAWTu1/DS4i6MW9XsaFYo+wL3eWqhJRGYYjd7xEDso4j+oRAJUGY uzduYtcos06dGEAB+lPVWW8/9L+VzV96jGDzS/x7wA+ukBPs X-Google-Smtp-Source: APXvYqzAyE1adC0QpUJCs8Ye23sqiotvMVlnP2cgk6HkuRMvwt0vb++YWRxrBQhUYpikArq14m2iCEvP0iVrKUCfa85NFv8zMkVn MIME-Version: 1.0 X-Received: by 2002:a02:13c3:: with SMTP id 186mr76485877jaz.30.1563871745940; Tue, 23 Jul 2019 01:49:05 -0700 (PDT) Date: Tue, 23 Jul 2019 01:49:05 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e42667058e554371@google.com> Subject: KASAN: use-after-free Read in nr_rx_frame (2) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 3bfe1fc4 Merge tag 'for-5.3/dm-changes-2' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10413e34600000 kernel config: https://syzkaller.appspot.com/x/.config?x=21511d77e11db3cb dashboard link: https://syzkaller.appspot.com/bug?extid=701728447042217b67c1 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+701728447042217b67c1@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x7c/0x280 /lib/refcount.c:123 Read of size 4 at addr ffff88808ee52080 by task swapper/1/0 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.2.0+ #35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack /lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 /lib/dump_stack.c:113 print_address_description+0x75/0x5b0 /mm/kasan/report.c:351 __kasan_report+0x14b/0x1c0 /mm/kasan/report.c:482 kasan_report+0x26/0x50 /mm/kasan/common.c:612 check_memory_region_inline /mm/kasan/generic.c:182 [inline] check_memory_region+0x2cf/0x2e0 /mm/kasan/generic.c:192 __kasan_check_read+0x11/0x20 /mm/kasan/common.c:92 atomic_read /./include/asm-generic/atomic-instrumented.h:26 [inline] refcount_inc_not_zero_checked+0x7c/0x280 /lib/refcount.c:123 refcount_inc_checked+0x15/0x50 /lib/refcount.c:156 sock_hold /./include/net/sock.h:649 [inline] sk_add_node /./include/net/sock.h:701 [inline] nr_insert_socket /net/netrom/af_netrom.c:137 [inline] nr_rx_frame+0x17bc/0x1e40 /net/netrom/af_netrom.c:1023 nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59 call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322 expire_timers /kernel/time/timer.c:1366 [inline] __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685 run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698 __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777 invoke_softirq /kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 /kernel/softirq.c:413 exiting_irq /./arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x113/0x280 /arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828 RIP: 0010:native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:61 Code: 06 fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 c4 41 06 fa eb b0 90 90 e9 07 00 00 00 0f 00 2d 76 67 56 00 fb f4 90 e9 07 00 00 00 0f 00 2d 66 67 56 00 f4 c3 90 90 55 48 89 e5 RSP: 0018:ffff8880a98cfd38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11950db RBX: ffff8880a98bc340 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: ffffffff812d193a RDI: ffff8880a98bcb78 RBP: ffff8880a98cfd40 R08: ffff8880a98bcb90 R09: ffffed1015317869 R10: ffffed1015317869 R11: 0000000000000000 R12: 0000000000000001 R13: 1ffff11015317868 R14: dffffc0000000000 R15: dffffc0000000000 arch_cpu_idle+0xa/0x10 /arch/x86/kernel/process.c:571 default_idle_call+0x59/0xa0 /kernel/sched/idle.c:94 cpuidle_idle_call /kernel/sched/idle.c:154 [inline] do_idle+0x180/0x780 /kernel/sched/idle.c:263 cpu_startup_entry+0x25/0x30 /kernel/sched/idle.c:354 start_secondary+0x3f4/0x490 /arch/x86/kernel/smpboot.c:264 secondary_startup_64+0xa4/0xb0 /arch/x86/kernel/head_64.S:243 Allocated by task 0: save_stack /mm/kasan/common.c:69 [inline] set_track /mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 /mm/kasan/common.c:487 kasan_kmalloc+0x9/0x10 /mm/kasan/common.c:501 __do_kmalloc /mm/slab.c:3655 [inline] __kmalloc+0x254/0x340 /mm/slab.c:3664 kmalloc /./include/linux/slab.h:557 [inline] sk_prot_alloc+0xb0/0x290 /net/core/sock.c:1603 sk_alloc+0x38/0x950 /net/core/sock.c:1657 nr_make_new /net/netrom/af_netrom.c:476 [inline] nr_rx_frame+0xabc/0x1e40 /net/netrom/af_netrom.c:959 nr_loopback_timer+0x6a/0x140 /net/netrom/nr_loopback.c:59 call_timer_fn+0xec/0x200 /kernel/time/timer.c:1322 expire_timers /kernel/time/timer.c:1366 [inline] __run_timers+0x7cd/0x9c0 /kernel/time/timer.c:1685 run_timer_softirq+0x4a/0x90 /kernel/time/timer.c:1698 __do_softirq+0x333/0x7c4 /./arch/x86/include/asm/paravirt.h:777 Freed by task 4044: save_stack /mm/kasan/common.c:69 [inline] set_track /mm/kasan/common.c:77 [inline] __kasan_slab_free+0x12a/0x1e0 /mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 /mm/kasan/common.c:457 __cache_free /mm/slab.c:3425 [inline] kfree+0x115/0x200 /mm/slab.c:3756 sk_prot_free /net/core/sock.c:1640 [inline] __sk_destruct+0x567/0x660 /net/core/sock.c:1726 sk_destruct /net/core/sock.c:1734 [inline] __sk_free+0x317/0x3e0 /net/core/sock.c:1745 sk_free /net/core/sock.c:1756 [inline] sock_put /./include/net/sock.h:1725 [inline] sock_efree+0x60/0x80 /net/core/sock.c:2042 skb_release_head_state+0x100/0x220 /net/core/skbuff.c:652 skb_release_all /net/core/skbuff.c:663 [inline] __kfree_skb+0x25/0x170 /net/core/skbuff.c:679 kfree_skb+0x6f/0xb0 /net/core/skbuff.c:697 nr_accept+0x4ef/0x650 /net/netrom/af_netrom.c:819 __sys_accept4+0x5bc/0x9a0 /net/socket.c:1750 __do_sys_accept /net/socket.c:1791 [inline] __se_sys_accept /net/socket.c:1788 [inline] __x64_sys_accept+0x7d/0x90 /net/socket.c:1788 do_syscall_64+0xfe/0x140 /arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808ee52000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 128 bytes inside of 2048-byte region [ffff88808ee52000, ffff88808ee52800) The buggy address belongs to the page: page:ffffea00023b9480 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0xffff88808ee53100 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001732108 ffffea00025f5588 ffff8880aa400e00 raw: ffff88808ee53100 ffff88808ee52000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808ee51f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808ee52000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88808ee52080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808ee52100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808ee52180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. 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