BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
Read of size 8 at addr ffff88801e0d2af8 by task syz-executor.1/14376

CPU: 0 PID: 14376 Comm: syz-executor.1 Not tainted 5.9.0-rc8-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 squashfs_get_id+0x1ae/0x1d0 fs/squashfs/id.c:38
 squashfs_new_inode fs/squashfs/inode.c:55 [inline]
 squashfs_read_inode+0x1d3/0x1940 fs/squashfs/inode.c:120
 squashfs_fill_super+0x1079/0x1ecf fs/squashfs/super.c:310
 get_tree_bdev+0x421/0x740 fs/super.c:1342
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2875 [inline]
 path_mount+0x1387/0x20a0 fs/namespace.c:3192
 do_mount+0xf3/0x110 fs/namespace.c:3205
 __do_compat_sys_mount fs/compat.c:122 [inline]
 __se_compat_sys_mount fs/compat.c:89 [inline]
 __ia32_compat_sys_mount+0x193/0x710 fs/compat.c:89
 do_syscall_32_irqs_on arch/x86/entry/common.c:78 [inline]
 __do_fast_syscall_32+0x60/0x90 arch/x86/entry/common.c:137
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:160
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fd4549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f55cdf00 EFLAGS: 00000292 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00000000f55cdf70 RCX: 0000000020000100
RDX: 0000000020000000 RSI: 0000000000000000 RDI: 00000000f55cdfb0
RBP: 00000000f55cdfb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 8:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 kmem_cache_alloc_trace+0x174/0x300 mm/slab.c:3554
 kmalloc include/linux/slab.h:554 [inline]
 batadv_mcast_mla_softif_get_ipv6 net/batman-adv/multicast.c:478 [inline]
 batadv_mcast_mla_softif_get net/batman-adv/multicast.c:537 [inline]
 __batadv_mcast_mla_update net/batman-adv/multicast.c:912 [inline]
 batadv_mcast_mla_update+0x15c4/0x2b80 net/batman-adv/multicast.c:949
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Freed by task 8:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3422 [inline]
 kfree+0x10e/0x2b0 mm/slab.c:3760
 batadv_mcast_mla_list_free net/batman-adv/multicast.c:672 [inline]
 __batadv_mcast_mla_update net/batman-adv/multicast.c:927 [inline]
 batadv_mcast_mla_update+0x11ae/0x2b80 net/batman-adv/multicast.c:949
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

The buggy address belongs to the object at ffff88801e0d2ac0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
 32-byte region [ffff88801e0d2ac0, ffff88801e0d2ae0)
The buggy address belongs to the page:
page:00000000efdc8552 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801e0d2fc1 pfn:0x1e0d2
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0000a787c8 ffffea0000a73bc8 ffff88802c840100
raw: ffff88801e0d2fc1 ffff88801e0d2000 000000010000003a ffff888027125801
page dumped because: kasan: bad access detected
page->mem_cgroup:ffff888027125801

Memory state around the buggy address:
 ffff88801e0d2980: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
 ffff88801e0d2a00: 00 fc fc fc fc fc fc fc 00 fc fc fc fc fc fc fc
>ffff88801e0d2a80: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc
                                                                ^
 ffff88801e0d2b00: fa fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff88801e0d2b80: 00 fc fc fc fc fc fc fc fa fb fb fb fc fc fc fc
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