==================================================================
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 ffff888149aac8c0 by task syz.4.160/5837

CPU: 0 UID: 0 PID: 5837 Comm: syz.4.160 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_splice_read+0x654/0xeb0 mm/filemap.c:2897
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x4b7/0xc90 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
 ovl_copy_up_file+0x5d2/0x810 fs/overlayfs/copy_up.c:334
 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:863 [inline]
 ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
 ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline]
 ovl_copy_up_flags+0x1f4e/0x4470 fs/overlayfs/copy_up.c:1223
 ovl_link+0x85/0x320 fs/overlayfs/dir.c:716
 vfs_link+0x4f5/0x690 fs/namei.c:4739
 do_linkat+0x555/0x6f0 fs/namei.c:4809
 __do_sys_link fs/namei.c:4843 [inline]
 __se_sys_link fs/namei.c:4841 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4841
 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: 0033:0x7f7ba8579e79
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:00007f7ba92b6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056
RAX: ffffffffffffffda RBX: 00007f7ba8715f80 RCX: 00007f7ba8579e79
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000020000200
RBP: 00007f7ba85e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7ba8715f80 R15: 00007fff3c244c58
 </TASK>

Allocated by task 5837:
 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_splice_read+0x654/0xeb0 mm/filemap.c:2897
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x4b7/0xc90 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
 ovl_copy_up_file+0x5d2/0x810 fs/overlayfs/copy_up.c:334
 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:863 [inline]
 ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
 ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline]
 ovl_copy_up_flags+0x1f4e/0x4470 fs/overlayfs/copy_up.c:1223
 ovl_link+0x85/0x320 fs/overlayfs/dir.c:716
 vfs_link+0x4f5/0x690 fs/namei.c:4739
 do_linkat+0x555/0x6f0 fs/namei.c:4809
 __do_sys_link fs/namei.c:4843 [inline]
 __se_sys_link fs/namei.c:4841 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4841
 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 5837:
 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_splice_read+0x654/0xeb0 mm/filemap.c:2897
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x4b7/0xc90 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
 ovl_copy_up_file+0x5d2/0x810 fs/overlayfs/copy_up.c:334
 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:863 [inline]
 ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline]
 ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline]
 ovl_copy_up_flags+0x1f4e/0x4470 fs/overlayfs/copy_up.c:1223
 ovl_link+0x85/0x320 fs/overlayfs/dir.c:716
 vfs_link+0x4f5/0x690 fs/namei.c:4739
 do_linkat+0x555/0x6f0 fs/namei.c:4809
 __do_sys_link fs/namei.c:4843 [inline]
 __se_sys_link fs/namei.c:4841 [inline]
 __x64_sys_link+0x82/0x90 fs/namei.c:4841
 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 ffff888149aac880
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 64 bytes inside of
 freed 96-byte region [ffff888149aac880, ffff888149aac8e0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x149aac
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 057ff00000000000 ffff888015841280 dead000000000122 0000000000000000
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 0x352800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 5839, tgid 5838 (syz.0.159), ts 86856885012, free_ts 0
 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
 __ext4_fill_super fs/ext4/super.c:5430 [inline]
 ext4_fill_super+0x5579/0x6df0 fs/ext4/super.c:5671
 get_tree_bdev+0x3f7/0x570 fs/super.c:1635
 vfs_get_tree+0x90/0x2a0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4055 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888149aac780: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff888149aac800: 00 00 00 00 00 00 00 00 00 05 fc fc fc fc fc fc
>ffff888149aac880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                           ^
 ffff888149aac900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888149aac980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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