loop1: 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 ffff8881482b29c0 by task syz.1.1547/8994 CPU: 0 UID: 0 PID: 8994 Comm: syz.1.1547 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: __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 integrity_kernel_read+0xb0/0x100 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0xaef/0x1b30 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x526/0xb20 security/integrity/ima/ima_api.c:293 process_measurement+0x1357/0x1fb0 security/integrity/ima/ima_main.c:372 ima_file_check+0xf2/0x170 security/integrity/ima/ima_main.c:572 security_file_post_open+0xb9/0x280 security/security.c:3154 do_open fs/namei.c:3776 [inline] path_openat+0x2cd0/0x3590 fs/namei.c:3933 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1442 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: 0033:0x7f0ef9979e79 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:00007f0efa7a6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f0ef9b15f80 RCX: 00007f0ef9979e79 RDX: 0000000000000000 RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 00007f0ef99e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0ef9b15f80 R15: 00007ffd4a218618 Allocated by task 8994: 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 integrity_kernel_read+0xb0/0x100 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0xaef/0x1b30 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x526/0xb20 security/integrity/ima/ima_api.c:293 process_measurement+0x1357/0x1fb0 security/integrity/ima/ima_main.c:372 ima_file_check+0xf2/0x170 security/integrity/ima/ima_main.c:572 security_file_post_open+0xb9/0x280 security/security.c:3154 do_open fs/namei.c:3776 [inline] path_openat+0x2cd0/0x3590 fs/namei.c:3933 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1442 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 8994: 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 integrity_kernel_read+0xb0/0x100 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0xaef/0x1b30 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x526/0xb20 security/integrity/ima/ima_api.c:293 process_measurement+0x1357/0x1fb0 security/integrity/ima/ima_main.c:372 ima_file_check+0xf2/0x170 security/integrity/ima/ima_main.c:572 security_file_post_open+0xb9/0x280 security/security.c:3154 do_open fs/namei.c:3776 [inline] path_openat+0x2cd0/0x3590 fs/namei.c:3933 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1442 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 ffff8881482b2980 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of freed 96-byte region [ffff8881482b2980, ffff8881482b29e0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1482b2 anon flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 057ff00000000000 ffff888015841280 ffffea0000baf3c0 dead000000000005 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 5230, tgid 5230 (syz-executor), ts 77518437137, free_ts 21768244031 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 ieee80211_register_hw+0x2a2d/0x3e10 net/mac80211/main.c:1477 mac80211_hwsim_new_radio+0x2a9f/0x4a90 drivers/net/wireless/virtual/mac80211_hwsim.c:5519 hwsim_new_radio_nl+0xece/0x2290 drivers/net/wireless/virtual/mac80211_hwsim.c:6203 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline] genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0xb14/0xec0 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 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_folios+0xe8a/0x1850 mm/page_alloc.c:2699 folios_put_refs+0x76e/0x860 mm/swap.c:1007 folio_batch_release include/linux/pagevec.h:101 [inline] truncate_inode_pages_range+0x47b/0xfc0 mm/truncate.c:346 kill_bdev block/bdev.c:91 [inline] blkdev_flush_mapping+0x108/0x250 block/bdev.c:671 blkdev_put_whole block/bdev.c:678 [inline] bdev_release+0x466/0x700 block/bdev.c:1103 blkdev_release+0x15/0x20 block/fops.c:638 __fput+0x24b/0x890 fs/file_table.c:424 task_work_run+0x24f/0x310 kernel/task_work.c:228 init_flush_fput init/do_mounts.h:51 [inline] mount_root_generic+0x1ca/0x3e0 init/do_mounts.c:211 prepare_namespace+0xc2/0x100 init/do_mounts.c:491 kernel_init_freeable+0x476/0x5d0 init/main.c:1593 kernel_init+0x1d/0x2b0 init/main.c:1469 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8881482b2880: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ffff8881482b2900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8881482b2980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8881482b2a00: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff8881482b2a80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ==================================================================