loop4: detected capacity change from 0 to 8
==================================================================
BUG: KASAN: slab-use-after-free in squashfs_page_actor_free fs/squashfs/page_actor.h:41 [inline]
BUG: KASAN: slab-use-after-free in squashfs_readahead+0x210c/0x2680 fs/squashfs/file.c:626
Read of size 4 at addr ffff888147efccc0 by task syz.4.4279/14907

CPU: 1 UID: 0 PID: 14907 Comm: syz.4.4279 Not tainted 6.11.0-rc4-next-20240822-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 squashfs_page_actor_free fs/squashfs/page_actor.h:41 [inline]
 squashfs_readahead+0x210c/0x2680 fs/squashfs/file.c:626
 read_pages+0x17e/0x840 mm/readahead.c:160
 page_cache_ra_unbounded+0x6ce/0x7f0 mm/readahead.c:273
 page_cache_sync_readahead include/linux/pagemap.h:1296 [inline]
 filemap_get_pages+0x543/0x2330 mm/filemap.c:2529
 filemap_read+0x457/0xfa0 mm/filemap.c:2628
 __kernel_read+0x532/0x9f0 fs/read_write.c:434
 prepare_binprm fs/exec.c:1686 [inline]
 search_binary_handler fs/exec.c:1735 [inline]
 exec_binprm fs/exec.c:1793 [inline]
 bprm_execve+0xa2b/0x1770 fs/exec.c:1844
 do_execveat_common+0x55f/0x6f0 fs/exec.c:1951
 do_execveat fs/exec.c:2036 [inline]
 __do_sys_execveat fs/exec.c:2110 [inline]
 __se_sys_execveat fs/exec.c:2104 [inline]
 __x64_sys_execveat+0xc4/0xe0 fs/exec.c:2104
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6217579e79
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f621839b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007f6217715f80 RCX: 00007f6217579e79
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 00007f62175e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6217715f80 R15: 00007ffda88ad0a8
 </TASK>

Allocated by task 14907:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4237
 kmalloc_noprof include/linux/slab.h:681 [inline]
 squashfs_page_actor_init_special+0x64/0x440 fs/squashfs/page_actor.c:113
 squashfs_readahead+0x188f/0x2680 fs/squashfs/file.c:619
 read_pages+0x17e/0x840 mm/readahead.c:160
 page_cache_ra_unbounded+0x6ce/0x7f0 mm/readahead.c:273
 page_cache_sync_readahead include/linux/pagemap.h:1296 [inline]
 filemap_get_pages+0x543/0x2330 mm/filemap.c:2529
 filemap_read+0x457/0xfa0 mm/filemap.c:2628
 __kernel_read+0x532/0x9f0 fs/read_write.c:434
 prepare_binprm fs/exec.c:1686 [inline]
 search_binary_handler fs/exec.c:1735 [inline]
 exec_binprm fs/exec.c:1793 [inline]
 bprm_execve+0xa2b/0x1770 fs/exec.c:1844
 do_execveat_common+0x55f/0x6f0 fs/exec.c:1951
 do_execveat fs/exec.c:2036 [inline]
 __do_sys_execveat fs/exec.c:2110 [inline]
 __se_sys_execveat fs/exec.c:2104 [inline]
 __x64_sys_execveat+0xc4/0xe0 fs/exec.c:2104
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 14907:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2299 [inline]
 slab_free mm/slub.c:4521 [inline]
 kfree+0x196/0x3e0 mm/slub.c:4669
 squashfs_page_actor_free fs/squashfs/page_actor.h:39 [inline]
 squashfs_readahead+0x195b/0x2680 fs/squashfs/file.c:626
 read_pages+0x17e/0x840 mm/readahead.c:160
 page_cache_ra_unbounded+0x6ce/0x7f0 mm/readahead.c:273
 page_cache_sync_readahead include/linux/pagemap.h:1296 [inline]
 filemap_get_pages+0x543/0x2330 mm/filemap.c:2529
 filemap_read+0x457/0xfa0 mm/filemap.c:2628
 __kernel_read+0x532/0x9f0 fs/read_write.c:434
 prepare_binprm fs/exec.c:1686 [inline]
 search_binary_handler fs/exec.c:1735 [inline]
 exec_binprm fs/exec.c:1793 [inline]
 bprm_execve+0xa2b/0x1770 fs/exec.c:1844
 do_execveat_common+0x55f/0x6f0 fs/exec.c:1951
 do_execveat fs/exec.c:2036 [inline]
 __do_sys_execveat fs/exec.c:2110 [inline]
 __se_sys_execveat fs/exec.c:2104 [inline]
 __x64_sys_execveat+0xc4/0xe0 fs/exec.c:2104
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888147efcc80
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 64 bytes inside of
 freed 96-byte region [ffff888147efcc80, ffff888147efcce0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x147efc
ksm flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 057ff00000000000 ffff888015841280 ffffea0000937640 dead000000000003
raw: 0000000000000000 0000000080200020 00000001fdffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 1, tgid 1 (swapper/0), ts 7446477723, free_ts 6539171784
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1517
 prep_new_page mm/page_alloc.c:1525 [inline]
 get_page_from_freelist+0x3131/0x3280 mm/page_alloc.c:3476
 __alloc_pages_noprof+0x29e/0x780 mm/page_alloc.c:4743
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2368
 allocate_slab+0x5a/0x2f0 mm/slub.c:2531
 new_slab mm/slub.c:2584 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3771
 __slab_alloc+0x58/0xa0 mm/slub.c:3861
 __slab_alloc_node mm/slub.c:3914 [inline]
 slab_alloc_node mm/slub.c:4073 [inline]
 __kmalloc_cache_node_noprof+0x20c/0x300 mm/slub.c:4245
 kmalloc_node_noprof include/linux/slab.h:704 [inline]
 alloc_node_nr_active kernel/workqueue.c:4844 [inline]
 __alloc_workqueue+0x709/0x1f20 kernel/workqueue.c:5697
 alloc_workqueue+0xd6/0x210 kernel/workqueue.c:5757
 usbip_init_eh+0x26/0x60 drivers/usb/usbip/usbip_event.c:130
 do_one_initcall+0x248/0x880 init/main.c:1269
 do_initcall_level+0x157/0x210 init/main.c:1331
 do_initcalls+0x3f/0x80 init/main.c:1347
 kernel_init_freeable+0x435/0x5d0 init/main.c:1580
 kernel_init+0x1d/0x2b0 init/main.c:1469
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1098 [inline]
 free_unref_page+0xc07/0xd90 mm/page_alloc.c:2651
 vfree+0x186/0x2e0 mm/vmalloc.c:3380
 free_partitions block/partitions/core.c:110 [inline]
 check_partition block/partitions/core.c:169 [inline]
 blk_add_partitions block/partitions/core.c:579 [inline]
 bdev_disk_changed+0x80e/0x13d0 block/partitions/core.c:683
 blkdev_get_whole+0x2d2/0x450 block/bdev.c:707
 bdev_open+0x2d4/0xc60 block/bdev.c:916
 bdev_file_open_by_dev+0x1b0/0x230 block/bdev.c:1018
 disk_scan_partitions+0x1be/0x2b0 block/genhd.c:367
 device_add_disk+0xd02/0x1000 block/genhd.c:510
 add_disk include/linux/blkdev.h:732 [inline]
 null_add_dev+0x153f/0x2000 drivers/block/null_blk/main.c:1986
 null_create_dev drivers/block/null_blk/main.c:2040 [inline]
 null_init+0x3de/0x570 drivers/block/null_blk/main.c:2112
 do_one_initcall+0x248/0x880 init/main.c:1269
 do_initcall_level+0x157/0x210 init/main.c:1331
 do_initcalls+0x3f/0x80 init/main.c:1347
 kernel_init_freeable+0x435/0x5d0 init/main.c:1580
 kernel_init+0x1d/0x2b0 init/main.c:1469
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147

Memory state around the buggy address:
 ffff888147efcb80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888147efcc00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
>ffff888147efcc80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                           ^
 ffff888147efcd00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff888147efcd80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
==================================================================