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Date: Fri, 22 Nov 2019 21:45:08 -0800 From: syzbot <syzbot+4d5170758f3762109542@...kaller.appspotmail.com> To: davem@...emloft.net, gregkh@...uxfoundation.org, jouni.hogander@...kie.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com, tglx@...utronix.de Subject: KASAN: use-after-free Read in slip_open Hello, syzbot found the following crash on: HEAD commit: af42d346 Linux 5.4-rc8 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=113a01cee00000 kernel config: https://syzkaller.appspot.com/x/.config?x=4737c15fc47048f2 dashboard link: https://syzkaller.appspot.com/bug?extid=4d5170758f3762109542 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13d90bbae00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16e529d2e00000 Bisection is inconclusive: the first bad commit could be any of: 6ef35398 rtc: Add Amlogic Virtual Wake RTC 1d74f099 dt-bindings: rtc: add bindings for FlexTimer Module ed162396 dt-bindings: rtc: new binding for Amlogic VRTC 7b0b551d rtc: fsl-ftm-alarm: add FTM alarm driver a6f26606 rtc: rv3029: revert error handling patch to rv3029_eeprom_write() 80ba9363 rtc: ds1672: remove unnecessary check 903e259f dt-bindings: rtc: sun6i: Add compatible for H6 RTC 44c638ce rtc: remove superfluous error message b60ff2cf rtc: sun6i: Add support for H6 RTC 924068e5 rtc: class: add debug message when registration fails e788771c rtc: pcf2127: convert to devm_rtc_allocate_device bbfe3a7a rtc: pcf2127: cleanup register and bit defines cb36cf80 rtc: pcf2123: add proper compatible string 7f43020e rtc: pcf2127: bugfix: read rtc disables watchdog d5b626e1 rtc: pcf2123: let the core handle range offsetting 0e735eaa rtc: pcf2127: add watchdog feature support 935a7f45 rtc: pcf2123: convert to devm_rtc_allocate_device 03623b4b rtc: pcf2127: add tamper detection support 9a5aeaad rtc: pcf2123: remove useless error path goto 28abbba3 rtc: pcf2127: bugfix: watchdog build dependency 9126a2b1 rtc: pcf2123: rename struct and variables 6fd4fe9b rtc: snvs: fix possible race condition d3bad602 rtc: pcf2123: stop using dev.platform_data 577f6482 rtc: pcf2123: implement .alarm_irq_enable 79610340 rtc: snvs: set range c59a9fc7 rtc: snvs: switch to rtc_time64_to_tm/rtc_tm_to_time64 d0ce6ef7 rtc; pcf2123: fix possible alarm race condition 5bdf40da rtc: pcf2123: don't use weekday alarm 7ef66122 rtc: pcf85363/pcf85263: fix regmap error in set_time 59a7f24f rtc: max77686: convert to devm_i2c_new_dummy_device() faac9102 rtc: Remove dev_err() usage after platform_get_irq() 4053e749 rtc: s35390a: convert to devm_i2c_new_dummy_device() b0a3fa44 rtc: mxc: use spin_lock_irqsave instead of spin_lock_irq in IRQ context 41a8e19f rtc: bd70528: fix driver dependencies cd646ec0 rtc: pcf8563: add Epson RTC8564 compatible cb3cab06 rtc: remove w90x900/nuc900 driver deaa3ff4 rtc: pcf8563: add Microcrystal RV8564 compatible 8d3f805e rtc: pcf8563: convert to devm_rtc_allocate_device aae364d2 rtc: s5m: convert to i2c_new_dummy_device c7d5f6db rtc: pcf8563: remove useless indirection ca83542c rtc: s35390a: convert to i2c_new_dummy_device 7150710f rtc: max77686: convert to i2c_new_dummy_device f648d40b rtc: pcf8563: let the core handle range offsetting 46eabee1 rtc: isl12026: convert to i2c_new_dummy_device d76a81d0 rtc: sun6i: Allow using as wakeup source from suspend 4a9eb815 dt-bindings: rtc: ds1307: add rx8130 compatible 56422541 dt-bindings: rtc: Remove the PCF8563 from the trivial RTCs e02e3dda rtc: sc27xx: Remove clearing SPRD_RTC_POWEROFF_ALM_FLAG flag f7234a98 rtc: imxdi: use devm_platform_ioremap_resource() to simplify code 874532cd rtc: mxc_v2: use devm_platform_ioremap_resource() to simplify code b99a3120 rtc: meson: mark PM functions as __maybe_unused 9dbd83f6 Merge tag 'rtc-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11bbd3bae00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+4d5170758f3762109542@...kaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in sl_sync drivers/net/slip/slip.c:725 [inline] BUG: KASAN: use-after-free in slip_open+0xecd/0x11b7 drivers/net/slip/slip.c:801 Read of size 8 at addr ffff88809431cb48 by task syz-executor276/8797 CPU: 0 PID: 8797 Comm: syz-executor276 Not tainted 5.4.0-rc8 #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 sl_sync drivers/net/slip/slip.c:725 [inline] slip_open+0xecd/0x11b7 drivers/net/slip/slip.c:801 tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469 tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596 tiocsetd drivers/tty/tty_io.c:2334 [inline] tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441149 Code: e8 5c ae 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcfb9185b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441149 RDX: 0000000020000040 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00007ffcfb9185d0 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8796: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 __do_kmalloc_node mm/slab.c:3615 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3622 kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x68/0x100 mm/util.c:564 kvmalloc include/linux/mm.h:670 [inline] kvzalloc include/linux/mm.h:678 [inline] alloc_netdev_mqs+0x98/0xde0 net/core/dev.c:9499 sl_alloc drivers/net/slip/slip.c:751 [inline] slip_open+0x38e/0x11b7 drivers/net/slip/slip.c:812 tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469 tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596 tiocsetd drivers/tty/tty_io.c:2334 [inline] tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8796: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 kvfree+0x61/0x70 mm/util.c:593 netdev_freemem net/core/dev.c:9453 [inline] free_netdev+0x3c0/0x470 net/core/dev.c:9608 slip_open+0xd70/0x11b7 drivers/net/slip/slip.c:858 tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469 tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596 tiocsetd drivers/tty/tty_io.c:2334 [inline] tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88809431c000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2888 bytes inside of 4096-byte region [ffff88809431c000, ffff88809431d000) The buggy address belongs to the page: page:ffffea000250c700 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 raw: 01fffc0000010200 ffffea0002a18b88 ffffea0002a14788 ffff8880aa402000 raw: 0000000000000000 ffff88809431c000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809431ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809431ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff88809431cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809431cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809431cc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
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