================================================================== BUG: KASAN: slab-out-of-bounds in udf_readdir+0xcaa/0x2170 fs/udf/dir.c:182 Write of size 149 at addr ffff88805b56006a by task syz.2.34/4087 CPU: 1 PID: 4087 Comm: syz.2.34 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 udf_readdir+0xcaa/0x2170 fs/udf/dir.c:182 iterate_dir+0x224/0x570 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7faefe1e9ff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007faefc662038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007faefe3a1f80 RCX: 00007faefe1e9ff9 RDX: 0000000000001000 RSI: 0000000020000840 RDI: 0000000000000009 RBP: 00007faefe25c296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007faefe3a1f80 R15: 00007ffcd961bc78 Allocated by task 4087: 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+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x143/0x290 mm/slub.c:3247 kmalloc include/linux/slab.h:591 [inline] udf_readdir+0xbc6/0x2170 fs/udf/dir.c:172 iterate_dir+0x224/0x570 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88805b560000 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 106 bytes inside of 256-byte region [ffff88805b560000, ffff88805b560100) The buggy address belongs to the page: page:ffffea00016d5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5b560 head:ffffea00016d5800 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888017041b40 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4087, ts 79940184419, free_ts 78704988532 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5423 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x1a0/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] udf_readdir+0xbc6/0x2170 fs/udf/dir.c:172 iterate_dir+0x224/0x570 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page_list+0x1f7/0x8e0 mm/page_alloc.c:3433 release_pages+0x1bb9/0x1f40 mm/swap.c:963 __pagevec_release+0x80/0xf0 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] __invalidate_mapping_pages+0x68f/0x7c0 mm/truncate.c:509 btrfs_close_bdev fs/btrfs/volumes.c:1150 [inline] btrfs_close_one_device fs/btrfs/volumes.c:1174 [inline] close_fs_devices+0x41e/0x8e0 fs/btrfs/volumes.c:1217 btrfs_close_devices+0xc4/0x5c0 fs/btrfs/volumes.c:1232 close_ctree+0x731/0x890 fs/btrfs/disk-io.c:4518 generic_shutdown_super+0x136/0x2c0 fs/super.c:475 kill_anon_super+0x37/0x60 fs/super.c:1087 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2391 deactivate_locked_super+0xa0/0x110 fs/super.c:335 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143 task_work_run+0x129/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 Memory state around the buggy address: ffff88805b55ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805b560000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805b560080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 06 ^ ffff88805b560100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805b560180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================