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Message-ID: <000000000000a2a25b0568d750c3@google.com> Date: Sun, 01 Apr 2018 23:01:03 -0700 From: syzbot <syzbot+f3ce716af730c8f96637@...kaller.appspotmail.com> To: dasaratharaman.chandramouli@...el.com, dledford@...hat.com, jgg@...pe.ca, leonro@...lanox.com, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org, markb@...lanox.com, monis@...lanox.com, parav@...lanox.com, syzkaller-bugs@...glegroups.com Subject: KASAN: use-after-free Read in rdma_listen Hello, syzbot hit the following crash on upstream commit 10b84daddbec72c6b440216a69de9a9605127f7a (Sat Mar 31 17:59:00 2018 +0000) Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=f3ce716af730c8f96637 So far this crash happened 4 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6306348723601408 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=6405720039751680 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6416847360491520 Kernel config: https://syzkaller.appspot.com/x/.config?id=-2760467897697295172 compiler: gcc (GCC) 7.1.1 20170620 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f3ce716af730c8f96637@...kaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0xc6/0xd0 lib/list_debug.c:26 Read of size 8 at addr ffff8801d7ba9cd8 by task syzkaller817651/5232 CPU: 1 PID: 5232 Comm: syzkaller817651 Not tainted 4.16.0-rc7+ #374 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __list_add_valid+0xc6/0xd0 lib/list_debug.c:26 __list_add include/linux/list.h:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2309 [inline] rdma_listen+0x581/0x8e0 drivers/infiniband/core/cma.c:3333 ucma_listen+0x172/0x1f0 drivers/infiniband/core/ucma.c:1074 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1656 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4415e9 RSP: 002b:00007fffa7eaaf98 EFLAGS: 00000207 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004415e9 RDX: 00000000fffffd4e RSI: 00000000200008c0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00000000a7eab118 R09: 00000000a7eab118 R10: 00000000a7eab118 R11: 0000000000000207 R12: 0000000000006463 R13: 00000000006cd448 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5230: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:552 kmem_cache_alloc_trace+0x136/0x740 mm/slab.c:3608 kmalloc include/linux/slab.h:512 [inline] kzalloc include/linux/slab.h:701 [inline] rdma_create_id+0xd0/0x630 drivers/infiniband/core/cma.c:787 ucma_create_id+0x35f/0x920 drivers/infiniband/core/ucma.c:480 ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1656 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 5230: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:520 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:527 __cache_free mm/slab.c:3486 [inline] kfree+0xd9/0x260 mm/slab.c:3801 rdma_destroy_id+0x821/0xda0 drivers/infiniband/core/cma.c:1691 ucma_close+0x100/0x2f0 drivers/infiniband/core/ucma.c:1735 __fput+0x327/0x7e0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 SYSC_exit_group kernel/exit.c:979 [inline] SyS_exit_group+0x1d/0x20 kernel/exit.c:977 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8801d7ba9b00 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 472 bytes inside of 1024-byte region [ffff8801d7ba9b00, ffff8801d7ba9f00) The buggy address belongs to the page: page:ffffea00075eea00 count:1 mapcount:0 mapping:ffff8801d7ba8000 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffff8801d7ba8000 0000000000000000 0000000100000007 raw: ffffea0006b2af20 ffffea00075f6520 ffff8801dac00ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d7ba9b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d7ba9c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8801d7ba9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801d7ba9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d7ba9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@...glegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.
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