================================================================== BUG: KASAN: use-after-free in f2fs_evict_inode+0xdad/0x1070 syzkaller/managers/linux-4-14/kernel/fs/f2fs/inode.c:544 Read of size 4 at addr ffff888055eef7f0 by task syz-executor.5/11709 CPU: 0 PID: 11709 Comm: syz-executor.5 Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:351 kasan_report syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:409 [inline] __asan_report_load4_noabort+0x68/0x70 syzkaller/managers/linux-4-14/kernel/mm/kasan/report.c:429 f2fs_evict_inode+0xdad/0x1070 syzkaller/managers/linux-4-14/kernel/fs/f2fs/inode.c:544 evict+0x2c8/0x700 syzkaller/managers/linux-4-14/kernel/fs/inode.c:555 iput_final syzkaller/managers/linux-4-14/kernel/fs/inode.c:1524 [inline] iput+0x458/0x7e0 syzkaller/managers/linux-4-14/kernel/fs/inode.c:1551 dentry_unlink_inode+0x25c/0x310 syzkaller/managers/linux-4-14/kernel/fs/dcache.c:387 __dentry_kill+0x320/0x550 syzkaller/managers/linux-4-14/kernel/fs/dcache.c:591 shrink_dentry_list+0x2c2/0xac0 syzkaller/managers/linux-4-14/kernel/fs/dcache.c:1069 shrink_dcache_sb+0x105/0x1b0 syzkaller/managers/linux-4-14/kernel/fs/dcache.c:1191 f2fs_fill_super+0x127f/0x56a0 syzkaller/managers/linux-4-14/kernel/fs/f2fs/super.c:2767 mount_bdev+0x2b3/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1134 mount_fs+0x92/0x2a0 syzkaller/managers/linux-4-14/kernel/fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1046 vfs_kern_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1036 [inline] do_new_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2879 SYSC_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4672ba RSP: 002b:00007f44228d3fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00000000004672ba RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f44228d4000 RBP: 00007f44228d4040 R08: 00007f44228d4040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f44228d4000 R15: 0000000020000300 Allocated by task 11709: save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:551 kmem_cache_alloc_trace+0x131/0x3d0 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3618 kmalloc syzkaller/managers/linux-4-14/kernel/./include/linux/slab.h:488 [inline] kzalloc syzkaller/managers/linux-4-14/kernel/./include/linux/slab.h:661 [inline] f2fs_fill_super+0xef/0x56a0 syzkaller/managers/linux-4-14/kernel/fs/f2fs/super.c:2407 mount_bdev+0x2b3/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1134 mount_fs+0x92/0x2a0 syzkaller/managers/linux-4-14/kernel/fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1046 vfs_kern_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1036 [inline] do_new_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2879 SYSC_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 11709: save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:524 __cache_free syzkaller/managers/linux-4-14/kernel/mm/slab.c:3496 [inline] kfree+0xc9/0x250 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3815 f2fs_fill_super+0x1263/0x56a0 syzkaller/managers/linux-4-14/kernel/fs/f2fs/super.c:2762 mount_bdev+0x2b3/0x360 syzkaller/managers/linux-4-14/kernel/fs/super.c:1134 mount_fs+0x92/0x2a0 syzkaller/managers/linux-4-14/kernel/fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1046 vfs_kern_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:1036 [inline] do_new_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:2879 SYSC_mount syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 syzkaller/managers/linux-4-14/kernel/fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff888055eeeec0 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 2352 bytes inside of 4096-byte region [ffff888055eeeec0, ffff888055eefec0) The buggy address belongs to the page: page:ffffea000157bb80 count:1 mapcount:0 mapping:ffff888055eeeec0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff888055eeeec0 0000000000000000 0000000100000001 raw: ffffea000157bb20 ffffea0002d3a220 ffff88813fe80dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888055eef680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888055eef700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888055eef780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888055eef800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888055eef880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================