================================================================== BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x68f/0x710 fs/hfs/trans.c:133 Write of size 1 at addr ffff8880b33dd14e by task syz-executor.2/12958 CPU: 0 PID: 12958 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_store1_noabort+0x88/0x90 mm/kasan/report.c:435 hfs_asc2mac+0x68f/0x710 fs/hfs/trans.c:133 hfs_cat_build_key+0xbe/0x1a0 fs/hfs/catalog.c:28 hfs_lookup+0x1c2/0x300 fs/hfs/dir.c:31 __lookup_hash+0x117/0x180 fs/namei.c:1547 do_unlinkat+0x295/0x660 fs/namei.c:4052 __do_sys_unlinkat fs/namei.c:4107 [inline] __se_sys_unlinkat fs/namei.c:4099 [inline] __x64_sys_unlinkat+0xbd/0x120 fs/namei.c:4099 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8849a500c9 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:00007f8847fc2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007f8849b6ff80 RCX: 00007f8849a500c9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007f8849aabae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc6ca8692f R14: 00007f8847fc2300 R15: 0000000000022000 Allocated by task 12958: __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] hfs_find_init+0x91/0x230 fs/hfs/bfind.c:21 hfs_lookup+0xfe/0x300 fs/hfs/dir.c:28 __lookup_hash+0x117/0x180 fs/namei.c:1547 do_unlinkat+0x295/0x660 fs/namei.c:4052 __do_sys_unlinkat fs/namei.c:4107 [inline] __se_sys_unlinkat fs/namei.c:4099 [inline] __x64_sys_unlinkat+0xbd/0x120 fs/namei.c:4099 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 11825: __cache_free mm/slab.c:3503 [inline] kfree+0xcc/0x210 mm/slab.c:3822 kvfree+0x59/0x60 mm/util.c:452 __free_fdtable fs/file.c:32 [inline] put_files_struct fs/file.c:420 [inline] put_files_struct+0x291/0x350 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0xbb9/0x2be0 kernel/exit.c:865 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880b33dd100 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 78 bytes inside of 96-byte region [ffff8880b33dd100, ffff8880b33dd160) The buggy address belongs to the page: page:ffffea0002ccf740 count:1 mapcount:0 mapping:ffff88813bff04c0 index:0xffff8880b33dd080 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea000277ab08 ffffea0002432248 ffff88813bff04c0 raw: ffff8880b33dd080 ffff8880b33dd000 0000000100000018 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880b33dd000: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880b33dd080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8880b33dd100: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc ^ ffff8880b33dd180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8880b33dd200: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ==================================================================