loop1: detected capacity change from 0 to 8
process 'syz.1.2929' launched './file0/file0' with NULL argv: empty string added
==================================================================
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 ffff88802b834bc0 by task syz.1.2929/12342

CPU: 0 UID: 0 PID: 12342 Comm: syz.1.2929 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: 0033:0x7f0ff9779e79
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:00007f0ffa5c9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 00007f0ff9915f80 RCX: 00007f0ff9779e79
RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 00007f0ff97e7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f0ff9915f80 R15: 00007ffe907ea3f8
 </TASK>

Allocated by task 12342:
 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 12342:
 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 ffff88802b834b80
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 64 bytes inside of
 freed 96-byte region [ffff88802b834b80, ffff88802b834be0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b834
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000000 ffff888015841280 ffffea0000a53040 dead000000000002
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 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 5376, tgid 5375 (syz.1.28), ts 107628199288, free_ts 107603722396
 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]
 __do_kmalloc_node mm/slub.c:4205 [inline]
 __kmalloc_noprof+0x25a/0x400 mm/slub.c:4218
 kmalloc_noprof include/linux/slab.h:685 [inline]
 kzalloc_noprof include/linux/slab.h:817 [inline]
 cfg80211_inform_single_bss_data+0xaff/0x2030 net/wireless/scan.c:2307
 cfg80211_inform_bss_data+0x3dd/0x5a70 net/wireless/scan.c:3159
 cfg80211_inform_bss_frame_data+0x3b8/0x720 net/wireless/scan.c:3254
 ieee80211_bss_info_update+0x8a7/0xbc0 net/mac80211/scan.c:226
 ieee80211_scan_rx+0x526/0x9c0 net/mac80211/scan.c:340
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5225 [inline]
 ieee80211_rx_list+0x2b02/0x3780 net/mac80211/rx.c:5462
 ieee80211_rx_napi+0x18a/0x3c0 net/mac80211/rx.c:5485
 ieee80211_rx include/net/mac80211.h:5124 [inline]
 ieee80211_handle_queued_frames+0xe7/0x1e0 net/mac80211/main.c:439
page last free pid 4684 tgid 4684 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
 __slab_free+0x31b/0x3d0 mm/slub.c:4432
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4036 [inline]
 slab_alloc_node mm/slub.c:4085 [inline]
 __do_kmalloc_node mm/slub.c:4205 [inline]
 __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4218
 kmalloc_noprof include/linux/slab.h:685 [inline]
 tomoyo_realpath_from_path+0xcf/0x5e0 security/tomoyo/realpath.c:251
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x2b7/0x740 security/tomoyo/file.c:822
 security_inode_getattr+0x130/0x330 security/security.c:2400
 vfs_getattr+0x45/0x430 fs/stat.c:242
 vfs_fstat fs/stat.c:267 [inline]
 vfs_fstatat+0xe4/0x190 fs/stat.c:376
 __do_sys_newfstatat fs/stat.c:543 [inline]
 __se_sys_newfstatat fs/stat.c:537 [inline]
 __x64_sys_newfstatat+0x11d/0x1a0 fs/stat.c:537
 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

Memory state around the buggy address:
 ffff88802b834a80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff88802b834b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff88802b834b80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                           ^
 ffff88802b834c00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88802b834c80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================