==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xd74/0xeec fs/sysv/ialloc.c:153
Read of size 2 at addr ffff0000ec7bb1ce by task syz-executor.3/4322

CPU: 1 PID: 4322 Comm: syz-executor.3 Not tainted 5.15.155-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load2_noabort+0x44/0x50 mm/kasan/report_generic.c:307
 sysv_new_inode+0xd74/0xeec fs/sysv/ialloc.c:153
 sysv_mknod+0x5c/0x100 fs/sysv/namei.c:53
 sysv_create+0x38/0x4c fs/sysv/namei.c:67
 lookup_open fs/namei.c:3462 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0xf18/0x26cc fs/namei.c:3739
 do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
 do_sys_openat2+0x128/0x3d8 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the page:
page:00000000fe51f729 refcount:0 mapcount:0 mapping:0000000000000000 index:0x100 pfn:0x12c7bb
flags: 0x5ffe00000000000(node=0|zone=2|lastcpupid=0xfff)
raw: 05ffe00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000100 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ec7bb080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ec7bb100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000ec7bb180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000ec7bb200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000ec7bb280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
attempt to access beyond end of device
loop3: rw=0, want=6491538, limit=128
Buffer I/O error on dev loop3, logical block 3245768, async page read
attempt to access beyond end of device
loop3: rw=0, want=17666808, limit=128
Buffer I/O error on dev loop3, logical block 8833403, async page read
attempt to access beyond end of device
loop3: rw=0, want=26539620, limit=128
Buffer I/O error on dev loop3, logical block 13269809, async page read
attempt to access beyond end of device
loop3: rw=0, want=16147214, limit=128
Buffer I/O error on dev loop3, logical block 8073606, async page read
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_block: flc_count > flc_size
sysv_free_inode: inode 0,1,2 or nonexistent inode