================================================================== BUG: KASAN: slab-out-of-bounds in udf_write_aext+0x4c0/0x668 fs/udf/inode.c:2088 Write of size 4 at addr ffff0000d457aff0 by task syz-executor.4/7697 CPU: 1 PID: 7697 Comm: syz-executor.4 Not tainted 6.2.0-syzkaller-18295-ga9b06ec42c0f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 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+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x178/0x4e0 mm/kasan/report.c:417 kasan_report+0xd4/0x130 mm/kasan/report.c:517 __asan_report_store_n_noabort+0x28/0x34 mm/kasan/report_generic.c:367 udf_write_aext+0x4c0/0x668 fs/udf/inode.c:2088 udf_add_entry+0x11e0/0x28b0 fs/udf/namei.c:482 udf_mkdir+0x158/0x7e0 fs/udf/namei.c:681 vfs_mkdir+0x334/0x4e4 fs/namei.c:4036 do_mkdirat+0x200/0x5f8 fs/namei.c:4061 __do_sys_mkdirat fs/namei.c:4076 [inline] __se_sys_mkdirat fs/namei.c:4074 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4074 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 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+0x190/0x194 arch/arm64/kernel/entry.S:591 Allocated by task 7697: 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:512 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc+0xd8/0x1c4 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] udf_alloc_i_data fs/udf/inode.c:1600 [inline] udf_read_inode fs/udf/inode.c:1403 [inline] __udf_iget+0xa88/0x3060 fs/udf/inode.c:1895 udf_iget fs/udf/udfdecl.h:151 [inline] udf_lookup+0x228/0x310 fs/udf/namei.c:321 __lookup_hash+0x108/0x230 fs/namei.c:1601 do_renameat2+0x4b0/0x100c fs/namei.c:4873 __do_sys_renameat2 fs/namei.c:4963 [inline] __se_sys_renameat2 fs/namei.c:4960 [inline] __arm64_sys_renameat2+0xe0/0xfc fs/namei.c:4960 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 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+0x190/0x194 arch/arm64/kernel/entry.S:591 The buggy address belongs to the object at ffff0000d457ac00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 496 bytes to the right of 512-byte region [ffff0000d457ac00, ffff0000d457ae00) The buggy address belongs to the physical page: page:00000000056949a0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114578 head:00000000056949a0 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 ffff0000c0002600 fffffc00048f9600 dead000000000002 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d457ae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d457af00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d457af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d457b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d457b080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================