================================================================== BUG: KASAN: slab-use-after-free in ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5959 [inline] BUG: KASAN: slab-use-after-free in __ocfs2_flush_truncate_log+0x6d4/0x1140 fs/ocfs2/alloc.c:6054 Read of size 4 at addr ffff0000c5dacac0 by task syz-executor/6459 CPU: 0 UID: 0 PID: 6459 Comm: syz-executor Not tainted 6.14.0-rc3-syzkaller-ge6747d19291c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x198/0x538 mm/kasan/report.c:489 kasan_report+0xd8/0x138 mm/kasan/report.c:602 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5959 [inline] __ocfs2_flush_truncate_log+0x6d4/0x1140 fs/ocfs2/alloc.c:6054 ocfs2_flush_truncate_log+0x50/0x70 fs/ocfs2/alloc.c:6076 ocfs2_sync_fs+0x110/0x31c fs/ocfs2/super.c:406 sync_filesystem+0x1a0/0x218 fs/sync.c:66 generic_shutdown_super+0x70/0x2bc fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1413 __cleanup_mnt+0x20/0x30 fs/namespace.c:1420 task_work_run+0x230/0x2e0 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Allocated by task 6443: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4294 [inline] __kmalloc_noprof+0x32c/0x54c mm/slub.c:4306 kmalloc_noprof include/linux/slab.h:905 [inline] tomoyo_realpath_from_path+0xc8/0x4cc security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x1ec/0x414 security/tomoyo/file.c:771 tomoyo_file_open+0x15c/0x1ec security/tomoyo/tomoyo.c:334 security_file_open+0xc8/0x298 security/security.c:3114 do_dentry_open+0x2b8/0x1538 fs/open.c:933 vfs_open+0x48/0x2d8 fs/open.c:1086 do_open fs/namei.c:3830 [inline] path_openat+0x2308/0x2b1c fs/namei.c:3989 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 6443: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x180/0x478 mm/slub.c:4757 tomoyo_realpath_from_path+0x484/0x4cc security/tomoyo/realpath.c:286 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x1ec/0x414 security/tomoyo/file.c:771 tomoyo_file_open+0x15c/0x1ec security/tomoyo/tomoyo.c:334 security_file_open+0xc8/0x298 security/security.c:3114 do_dentry_open+0x2b8/0x1538 fs/open.c:933 vfs_open+0x48/0x2d8 fs/open.c:1086 do_open fs/namei.c:3830 [inline] path_openat+0x2308/0x2b1c fs/namei.c:3989 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000c5dac000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2752 bytes inside of freed 4096-byte region [ffff0000c5dac000, ffff0000c5dad000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x105da8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002140 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3176a01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c5dac980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c5daca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c5daca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c5dacb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c5dacb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ kernel BUG at fs/ocfs2/suballoc.c:2543! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 6459 Comm: syz-executor Tainted: G B 6.14.0-rc3-syzkaller-ge6747d19291c #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : _ocfs2_free_suballoc_bits+0xfa4/0x1324 fs/ocfs2/suballoc.c:2543 lr : _ocfs2_free_suballoc_bits+0xfa4/0x1324 fs/ocfs2/suballoc.c:2543 sp : ffff80009ece74c0 x29: ffff80009ece7640 x28: ffff0000dd00b338 x27: dfff800000000000 x26: ffff0000dd2e0d98 x25: ffff800082294ea8 x24: ffff700013d9ceac x23: 0000000007120dc0 x22: ffff0000f6e69e00 x21: 0000000000000e00 x20: 0000000000000e00 x19: 000000000001c000 x18: ffff0000d3abe7b0 x17: ffff80008fbbd000 x16: ffff80008b79a674 x15: 0000000000000001 x14: 0000000000000000 x13: 00000000fffffffc x12: ffff80009ece7560 x11: ffff80008229a074 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000eaef1e80 x7 : 0000000000000000 x6 : ffff800082294ea8 x5 : 0000000007120295 x4 : 000000000001c000 x3 : 0000000000000b2b x2 : ffff0000dd2e0d98 x1 : 0000000000000e00 x0 : 0000000007120dc0 Call trace: _ocfs2_free_suballoc_bits+0xfa4/0x1324 fs/ocfs2/suballoc.c:2543 (P) _ocfs2_free_clusters+0x53c/0xa30 fs/ocfs2/suballoc.c:2646 ocfs2_free_clusters+0x50/0x68 fs/ocfs2/suballoc.c:2667 ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5971 [inline] __ocfs2_flush_truncate_log+0x628/0x1140 fs/ocfs2/alloc.c:6054 ocfs2_flush_truncate_log+0x50/0x70 fs/ocfs2/alloc.c:6076 ocfs2_sync_fs+0x110/0x31c fs/ocfs2/super.c:406 sync_filesystem+0x1a0/0x218 fs/sync.c:66 generic_shutdown_super+0x70/0x2bc fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1413 __cleanup_mnt+0x20/0x30 fs/namespace.c:1420 task_work_run+0x230/0x2e0 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: 95725e06 97901542 d4210000 97901540 (d4210000) ---[ end trace 0000000000000000 ]---