==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xd24/0xe9c fs/sysv/ialloc.c:153
Read of size 2 at addr ffff0000f7e0c1ce by task syz.0.204/7460

CPU: 1 PID: 7460 Comm: syz.0.204 Not tainted 6.10.0-rc6-syzkaller-gfdd6064ff31c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379
 sysv_new_inode+0xd24/0xe9c 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:3505 [inline]
 open_last_lookups fs/namei.c:3574 [inline]
 path_openat+0xfb4/0x285c fs/namei.c:3804
 do_filp_open+0x1bc/0x3cc fs/namei.c:3834
 do_sys_openat2+0x124/0x1b8 fs/open.c:1405
 do_sys_open fs/open.c:1420 [inline]
 __do_sys_openat fs/open.c:1436 [inline]
 __se_sys_openat fs/open.c:1431 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1431
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x22ef0 pfn:0x137e0c
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 05ffc00000000000 fffffdffc3bc0008 fffffdffc3c02b08 0000000000000000
raw: 0000000000022ef0 0000000000000002 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f7e0c080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7e0c100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000f7e0c180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff0000f7e0c200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7e0c280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
syz.0.204: attempt to access beyond end of device
loop0: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop0, logical block 3245768, async page read
syz.0.204: attempt to access beyond end of device
loop0: rw=0, sector=17666806, nr_sectors = 2 limit=128
Buffer I/O error on dev loop0, logical block 8833403, async page read
syz.0.204: attempt to access beyond end of device
loop0: rw=0, sector=26539618, nr_sectors = 2 limit=128
Buffer I/O error on dev loop0, logical block 13269809, async page read
syz.0.204: attempt to access beyond end of device
loop0: rw=0, sector=16147212, nr_sectors = 2 limit=128
Buffer I/O error on dev loop0, 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