loop0: detected capacity change from 0 to 32768 ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in fs/jfs/jfs_dmap.c:2257:2 index 2621440 is out of range for type 's64[128]' (aka 'long long[128]') CPU: 1 UID: 0 PID: 6654 Comm: syz.0.9 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 ubsan_epilogue+0x14/0x48 lib/ubsan.c:233 __ubsan_handle_out_of_bounds+0xd0/0xfc lib/ubsan.c:455 dbAllocBits+0x87c/0x8c4 fs/jfs/jfs_dmap.c:2257 dbAllocDmap fs/jfs/jfs_dmap.c:2034 [inline] dbAllocNear+0x25c/0x350 fs/jfs/jfs_dmap.c:1247 dbAlloc+0x72c/0x9dc fs/jfs/jfs_dmap.c:832 diNewExt+0x768/0x253c fs/jfs/jfs_imap.c:2261 diAllocExt fs/jfs/jfs_imap.c:1952 [inline] diAllocAG+0x9bc/0x1a84 fs/jfs/jfs_imap.c:1669 diAlloc+0x17c/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x80/0x78c fs/jfs/jfs_inode.c:56 jfs_mkdir+0x170/0x8b4 fs/jfs/namei.c:225 vfs_mkdir+0x284/0x424 fs/namei.c:4453 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4501 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 ---[ end trace ]--- ================================================================== BUG: KASAN: slab-use-after-free in dbAllocBits+0x79c/0x8c4 fs/jfs/jfs_dmap.c:2257 Read of size 8 at addr ffff0000d629a038 by task syz.0.9/6654 CPU: 1 UID: 0 PID: 6654 Comm: syz.0.9 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0xb0/0x110 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 dbAllocBits+0x79c/0x8c4 fs/jfs/jfs_dmap.c:2257 dbAllocDmap fs/jfs/jfs_dmap.c:2034 [inline] dbAllocNear+0x25c/0x350 fs/jfs/jfs_dmap.c:1247 dbAlloc+0x72c/0x9dc fs/jfs/jfs_dmap.c:832 diNewExt+0x768/0x253c fs/jfs/jfs_imap.c:2261 diAllocExt fs/jfs/jfs_imap.c:1952 [inline] diAllocAG+0x9bc/0x1a84 fs/jfs/jfs_imap.c:1669 diAlloc+0x17c/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x80/0x78c fs/jfs/jfs_inode.c:56 jfs_mkdir+0x170/0x8b4 fs/jfs/namei.c:225 vfs_mkdir+0x284/0x424 fs/namei.c:4453 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4486 __do_sys_mkdirat fs/namei.c:4503 [inline] __se_sys_mkdirat fs/namei.c:4501 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4501 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Allocated by task 6193: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:417 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5650 [inline] __kmalloc_noprof+0x3fc/0x728 mm/slub.c:5662 kmalloc_noprof include/linux/slab.h:961 [inline] tomoyo_realpath_from_path+0xc4/0x4d4 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x178/0x31c security/tomoyo/file.c:771 tomoyo_file_open+0x154/0x1ec security/tomoyo/tomoyo.c:334 security_file_open+0xc8/0x298 security/security.c:3183 do_dentry_open+0x2a0/0x10bc fs/open.c:942 vfs_open+0x44/0x2d4 fs/open.c:1097 do_open fs/namei.c:3975 [inline] path_openat+0x2424/0x2c40 fs/namei.c:4134 do_filp_open+0x18c/0x36c fs/namei.c:4161 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1463 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Freed by task 6193: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:77 __kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2543 [inline] slab_free mm/slub.c:6642 [inline] kfree+0x184/0x600 mm/slub.c:6849 tomoyo_realpath_from_path+0x48c/0x4d4 security/tomoyo/realpath.c:286 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_check_open_permission+0x178/0x31c security/tomoyo/file.c:771 tomoyo_file_open+0x154/0x1ec security/tomoyo/tomoyo.c:334 security_file_open+0xc8/0x298 security/security.c:3183 do_dentry_open+0x2a0/0x10bc fs/open.c:942 vfs_open+0x44/0x2d4 fs/open.c:1097 do_open fs/namei.c:3975 [inline] path_openat+0x2424/0x2c40 fs/namei.c:4134 do_filp_open+0x18c/0x36c fs/namei.c:4161 do_sys_openat2+0x11c/0x1b4 fs/open.c:1437 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1463 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 The buggy address belongs to the object at ffff0000d629a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 56 bytes inside of freed 4096-byte region [ffff0000d629a000, ffff0000d629b000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x116298 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 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002140 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc358a601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d6299f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d6299f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d629a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d629a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d629a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ERROR: (device loop0): dbAlloc: the hint is outside the map ERROR: (device loop0): remounting filesystem as read-only