================================================================== BUG: KASAN: use-after-free in jfs_readdir+0xf44/0x3030 fs/jfs/jfs_dtree.c:2869 Read of size 8 at addr ffff0000ca7a5600 by task syz.7.1369/8810 CPU: 0 PID: 8810 Comm: syz.7.1369 Not tainted 6.1.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 jfs_readdir+0xf44/0x3030 fs/jfs/jfs_dtree.c:2869 iterate_dir+0x1f4/0x4ec __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 8810: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x458 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x230/0x37c mm/slub.c:3422 mempool_alloc_slab+0x58/0x74 mm/mempool.c:512 mempool_alloc+0x150/0x48c mm/mempool.c:392 alloc_metapage fs/jfs/jfs_metapage.c:176 [inline] __get_metapage+0x618/0x1050 fs/jfs/jfs_metapage.c:651 dtSplitRoot+0x21c/0x1424 fs/jfs/jfs_dtree.c:1909 dtSplitUp fs/jfs/jfs_dtree.c:992 [inline] dtInsert+0xf80/0x573c fs/jfs/jfs_dtree.c:870 jfs_mkdir+0x6bc/0xa0c fs/jfs/namei.c:270 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106 do_mkdirat+0x220/0x510 fs/namei.c:4131 __do_sys_mkdirat fs/namei.c:4146 [inline] __se_sys_mkdirat fs/namei.c:4144 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 8810: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x2f0/0x588 mm/slub.c:3683 mempool_free_slab+0x28/0x38 mm/mempool.c:519 mempool_free+0xbc/0x2e0 mm/mempool.c:501 free_metapage fs/jfs/jfs_metapage.c:191 [inline] drop_metapage fs/jfs/jfs_metapage.c:228 [inline] release_metapage+0x808/0xc84 fs/jfs/jfs_metapage.c:757 dtReadNext fs/jfs/jfs_dtree.c:3189 [inline] jfs_readdir+0xcb4/0x3030 fs/jfs/jfs_dtree.c:2862 iterate_dir+0x1f4/0x4ec __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64 fs/readdir.c:354 [inline] __arm64_sys_getdents64+0x1c4/0x4a0 fs/readdir.c:354 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000ca7a55d0 which belongs to the cache jfs_mp of size 184 The buggy address is located 48 bytes inside of 184-byte region [ffff0000ca7a55d0, ffff0000ca7a5688) The buggy address belongs to the physical page: page:00000000dc2bb97b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a7a5 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003c52b80 dead000000000002 ffff0000c6f2a000 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ca7a5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000ca7a5580: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb >ffff0000ca7a5600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000ca7a5680: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb ffff0000ca7a5700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================