syz.6.1015: attempt to access beyond end of device loop6: rw=524288, sector=8, nr_sectors = 80 limit=16 ================================================================== BUG: KASAN: use-after-free in memcpy_to_page include/linux/highmem.h:403 [inline] BUG: KASAN: use-after-free in z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347 Read of size 4096 at addr ffff0000f65ad000 by task syz.6.1015/7200 CPU: 1 PID: 7200 Comm: syz.6.1015 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memcpy+0x48/0x90 mm/kasan/shadow.c:65 memcpy_to_page include/linux/highmem.h:403 [inline] z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:435 z_erofs_decompress_pcluster fs/erofs/zdata.c:1159 [inline] z_erofs_decompress_queue+0x103c/0x1bf4 fs/erofs/zdata.c:1240 z_erofs_runqueue+0x1508/0x16a8 fs/erofs/zdata.c:1603 z_erofs_read_folio+0x2dc/0x5cc fs/erofs/zdata.c:1693 filemap_read_folio+0x134/0x384 mm/filemap.c:2490 filemap_fault+0x990/0xe98 mm/filemap.c:3340 __do_fault+0x11c/0x3d8 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1d04/0x3018 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x340/0x770 mm/gup.c:1250 populate_vma_page_range+0x1f4/0x298 mm/gup.c:1607 __mm_populate+0x214/0x338 mm/gup.c:1721 do_mlock+0x420/0x514 mm/mlock.c:608 __do_sys_mlock mm/mlock.c:616 [inline] __se_sys_mlock mm/mlock.c:614 [inline] __arm64_sys_mlock+0x60/0x78 mm/mlock.c:614 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 4390: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xd8/0x180 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2481 [inline] cfg80211_inform_bss_frame_data+0x554/0x10f8 net/wireless/scan.c:2542 ieee80211_bss_info_update+0x640/0xa7c net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x143c/0x2608 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1685 [inline] ieee80211_iface_work+0x5a8/0xa4c net/mac80211/iface.c:1739 cfg80211_wiphy_work+0x1e0/0x220 net/wireless/core.c:433 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Freed by task 4422: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] kmem_cache_free_bulk+0x340/0x3d4 mm/slub.c:3805 kfree_bulk include/linux/slab.h:475 [inline] kfree_rcu_work+0x29c/0x7d0 kernel/rcu/tree.c:3091 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:46 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 kvfree_call_rcu+0xb4/0x6f0 kernel/rcu/tree.c:3405 cfg80211_update_known_bss+0x11c/0x7fc net/wireless/scan.c:-1 cfg80211_bss_update+0x150/0x1ccc net/wireless/scan.c:1847 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2509 [inline] cfg80211_inform_bss_frame_data+0x890/0x10f8 net/wireless/scan.c:2542 ieee80211_bss_info_update+0x640/0xa7c net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x143c/0x2608 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1685 [inline] ieee80211_iface_work+0x5a8/0xa4c net/mac80211/iface.c:1739 cfg80211_wiphy_work+0x1e0/0x220 net/wireless/core.c:433 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000f65ad000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000f65ad000, ffff0000f65ad080) The buggy address belongs to the physical page: page:00000000fa42f539 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1365ad flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc00034bdfc0 dead000000000003 ffff0000c0002300 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f65acf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000f65acf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000f65ad000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f65ad080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f65ad100: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.6.1015: attempt to access beyond end of device loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16