SQUASHFS error: Unable to read inode 0x12d
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BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51
Read of size 8 at addr ffff8880b2943d10 by task syz-executor.0/15487

CPU: 1 PID: 15487 Comm: syz-executor.0 Not tainted 4.19.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:51
 squashfs_new_inode fs/squashfs/inode.c:64 [inline]
 squashfs_read_inode+0x1b4/0x1b40 fs/squashfs/inode.c:133
 squashfs_fill_super+0x1655/0x1c00 fs/squashfs/super.c:318
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2469 [inline]
 do_mount+0x113c/0x2f10 fs/namespace.c:2799
 ksys_mount+0xcf/0x130 fs/namespace.c:3015
 __do_sys_mount fs/namespace.c:3029 [inline]
 __se_sys_mount fs/namespace.c:3026 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3026
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x460c6a
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f3cca3c5a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3cca3c5b10 RCX: 0000000000460c6a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f3cca3c5ad0
RBP: 00007f3cca3c5ad0 R08: 00007f3cca3c5b10 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000
R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020010800

Allocated by task 6328:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc_track_caller+0x155/0x3c0 mm/slab.c:3742
 kmemdup+0x23/0x50 mm/util.c:118
 kmemdup include/linux/string.h:446 [inline]
 shmem_symlink+0x185/0x7c0 mm/shmem.c:3074
 vfs_symlink+0x453/0x6c0 fs/namei.c:4129
 do_symlinkat+0x258/0x2c0 fs/namei.c:4156
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6141:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 kobject_uevent_env+0x2a5/0x14a0 lib/kobject_uevent.c:622
 kobject_synth_uevent+0x700/0x820 lib/kobject_uevent.c:208
 uevent_store+0x21/0x70 drivers/base/core.c:1257
 dev_attr_store+0x56/0x80 drivers/base/core.c:966
 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139
 kernfs_fop_write+0x2b0/0x470 fs/kernfs/file.c:316
 __vfs_write+0xf7/0x770 fs/read_write.c:485
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880b2943d00
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 16 bytes inside of
 32-byte region [ffff8880b2943d00, ffff8880b2943d20)
The buggy address belongs to the page:
page:ffffea0002ca50c0 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880b2943fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002d67448 ffffea0002c0d248 ffff88813bff01c0
raw: ffff8880b2943fc1 ffff8880b2943000 000000010000003d 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b2943c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880b2943c80: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc
>ffff8880b2943d00: 00 01 fc fc fc fc fc fc 00 01 fc fc fc fc fc fc
                         ^
 ffff8880b2943d80: 00 fc fc fc fc fc fc fc 00 01 fc fc fc fc fc fc
 ffff8880b2943e00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
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