syz.4.116: attempt to access beyond end of device loop4: rw=0, sector=6491536, nr_sectors = 2 limit=128 Buffer I/O error on dev loop4, logical block 3245768, async page read ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7191 at fs/inode.c:464 inc_nlink+0x120/0x170 fs/inode.c:464 Modules linked in: CPU: 1 UID: 0 PID: 7191 Comm: syz.4.116 Not tainted 6.14.0-rc7-syzkaller-ga2392f333575 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : inc_nlink+0x120/0x170 fs/inode.c:464 lr : inc_nlink+0x120/0x170 fs/inode.c:464 sp : ffff80009fc97b80 x29: ffff80009fc97b80 x28: 1fffe0001e30e00c x27: dfff800000000000 x26: 0000000000000000 x25: 00000000000001c0 x24: 000000000000007e x23: 1fffe0001e30e010 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000f1870038 x19: ffff0000f1870080 x18: ffff80009fc973e0 x17: 0000000000034249 x16: ffff80008b7c7f00 x15: 0000000000000005 x14: 1ffff00013f92f48 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700013f92f4d x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000d1303d00 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : ffff80009fc97a20 x3 : 00000000000001c0 x2 : ffff0000da9dd608 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: inc_nlink+0x120/0x170 fs/inode.c:464 (P) inode_inc_link_count include/linux/fs.h:2577 [inline] sysv_mkdir+0x2c/0x138 fs/sysv/namei.c:119 vfs_mkdir+0x27c/0x410 fs/namei.c:4313 do_mkdirat+0x250/0x584 fs/namei.c:4336 __do_sys_mkdirat fs/namei.c:4351 [inline] __se_sys_mkdirat fs/namei.c:4349 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4349 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 3130 hardirqs last enabled at (3129): [] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234 hardirqs last disabled at (3130): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (3076): [] softirq_handle_end kernel/softirq.c:407 [inline] softirqs last enabled at (3076): [] handle_softirqs+0xb44/0xd34 kernel/softirq.c:589 softirqs last disabled at (3025): [] __do_softirq+0x14/0x20 kernel/softirq.c:595 ---[ end trace 0000000000000000 ]--- ================================================================== BUG: KASAN: use-after-free in sysv_new_inode+0xd28/0xebc fs/sysv/ialloc.c:153 Read of size 2 at addr ffff0000f48921ce by task syz.4.116/7191 CPU: 1 UID: 0 PID: 7191 Comm: syz.4.116 Tainted: G W 6.14.0-rc7-syzkaller-ga2392f333575 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x198/0x550 mm/kasan/report.c:521 kasan_report+0xd8/0x138 mm/kasan/report.c:634 __asan_report_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379 sysv_new_inode+0xd28/0xebc fs/sysv/ialloc.c:153 sysv_mkdir+0x44/0x138 fs/sysv/namei.c:121 vfs_mkdir+0x27c/0x410 fs/namei.c:4313 do_mkdirat+0x250/0x584 fs/namei.c:4336 __do_sys_mkdirat fs/namei.c:4351 [inline] __se_sys_mkdirat fs/namei.c:4349 [inline] __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4349 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xb2b pfn:0x134892 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000b2b 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f4892080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000f4892100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000f4892180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000f4892200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000f4892280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================