ext4 filesystem being mounted at /root/syzkaller-testdir3438572095/syzkaller.4tUQ7n/0/bus supports timestamps until 2038 (0x7fffffff) ================================================================== BUG: KASAN: use-after-free in crc16+0x216/0x2a0 lib/crc16.c:58 Read of size 1 at addr ffff88810739d000 by task syz-executor.0/434 CPU: 0 PID: 434 Comm: syz-executor.0 Not tainted 5.15.106-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3a0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x177/0x1c0 mm/kasan/report.c:451 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 crc16+0x216/0x2a0 lib/crc16.c:58 ext4_group_desc_csum+0x90b/0xc40 fs/ext4/super.c:2841 ext4_group_desc_csum_set+0x1d8/0x270 fs/ext4/super.c:2864 ext4_mb_clear_bb fs/ext4/mballoc.c:6046 [inline] ext4_free_blocks+0x1b6a/0x2c00 fs/ext4/mballoc.c:6192 ext4_remove_blocks fs/ext4/extents.c:2525 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2709 [inline] ext4_ext_remove_space+0x29b2/0x4a60 fs/ext4/extents.c:2957 ext4_ext_truncate+0x19a/0x240 fs/ext4/extents.c:4419 ext4_truncate+0x96c/0xfa0 fs/ext4/inode.c:4245 ext4_evict_inode+0xcaa/0x1490 fs/ext4/inode.c:289 evict+0x2a3/0x630 fs/inode.c:587 iput_final fs/inode.c:1663 [inline] iput+0x63b/0x7e0 fs/inode.c:1689 do_unlinkat+0x4db/0x910 fs/namei.c:4284 __do_sys_unlink fs/namei.c:4325 [inline] __se_sys_unlink fs/namei.c:4323 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4323 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f3d01fdc0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3d01b4f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007f3d020fbf80 RCX: 00007f3d01fdc0f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 00007f3d02037ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffdbe60d1f R14: 00007f3d01b4f300 R15: 0000000000022000 Allocated by task 1: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:513 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __kmalloc+0x13a/0x270 mm/slub.c:4407 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] kobject_get_path+0xbc/0x1f0 lib/kobject.c:184 kobject_uevent_env+0x27f/0x700 lib/kobject_uevent.c:529 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:642 kernel_add_sysfs_param+0x108/0x12d kernel/params.c:816 param_sysfs_builtin+0x16a/0x1e2 kernel/params.c:851 param_sysfs_init+0x6a/0x6f kernel/params.c:970 do_one_initcall+0x182/0x610 init/main.c:1306 do_initcall_level+0x186/0x304 init/main.c:1379 do_initcalls+0x4e/0x8e init/main.c:1395 do_basic_setup+0x81/0x8a init/main.c:1414 kernel_init_freeable+0x2c1/0x3f7 init/main.c:1619 kernel_init+0x1d/0x290 init/main.c:1510 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff88810739d000 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff88810739d000, ffff88810739d020) The buggy address belongs to the page: page:ffffea00041ce740 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810739ddc0 pfn:0x10739d flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00041e6b80 0000000600000006 ffff888100041500 raw: ffff88810739ddc0 000000008040000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 1054342265, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x15d/0x170 mm/page_alloc.c:2420 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x33e6/0x34c0 mm/page_alloc.c:4159 __alloc_pages+0x38a/0x7b0 mm/page_alloc.c:5421 allocate_slab mm/slub.c:1912 [inline] new_slab+0x92/0x490 mm/slub.c:1975 ___slab_alloc+0x39e/0x830 mm/slub.c:3008 __slab_alloc+0x4a/0x90 mm/slub.c:3095 slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc+0x16d/0x270 mm/slub.c:4403 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] kobject_get_path+0xbc/0x1f0 lib/kobject.c:184 kobject_uevent_env+0x27f/0x700 lib/kobject_uevent.c:529 kobject_uevent+0x1f/0x30 lib/kobject_uevent.c:642 kernel_add_sysfs_param+0x108/0x12d kernel/params.c:816 param_sysfs_builtin+0x16a/0x1e2 kernel/params.c:851 param_sysfs_init+0x6a/0x6f kernel/params.c:970 do_one_initcall+0x182/0x610 init/main.c:1306 do_initcall_level+0x186/0x304 init/main.c:1379 do_initcalls+0x4e/0x8e init/main.c:1395 page_owner free stack trace missing Memory state around the buggy address: ffff88810739cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810739cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810739d000: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff88810739d080: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff88810739d100: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================