================================================================== BUG: KASAN: slab-use-after-free in memcmp+0x1b5/0x1c0 lib/string.c:681 Read of size 8 at addr ffff88807983b000 by task syz-executor.0/9905 CPU: 0 PID: 9905 Comm: syz-executor.0 Not tainted 6.5.0-rc7-next-20230824-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 memcmp+0x1b5/0x1c0 lib/string.c:681 memcmp include/linux/fortify-string.h:728 [inline] compare_mount_options fs/ceph/super.c:653 [inline] ceph_compare_super+0x11a/0x8d0 fs/ceph/super.c:1233 sget_fc+0x582/0x9b0 fs/super.c:778 ceph_get_tree+0x6e6/0x1a10 fs/ceph/super.c:1318 vfs_get_tree+0x8c/0x370 fs/super.c:1713 vfs_cmd_create+0x11f/0x2f0 fs/fsopen.c:230 vfs_fsconfig_locked fs/fsopen.c:294 [inline] __do_sys_fsconfig+0x832/0xb90 fs/fsopen.c:475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6e5c87cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e5b3fe0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007f6e5c99bf80 RCX: 00007f6e5c87cae9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00007f6e5c8c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f6e5c99bf80 R15: 00007ffeec43a4b8 Allocated by task 9844: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] ceph_init_fs_context+0xc8/0x530 fs/ceph/super.c:1430 alloc_fs_context+0x56c/0x9f0 fs/fs_context.c:294 __do_sys_fsopen fs/fsopen.c:137 [inline] __se_sys_fsopen fs/fsopen.c:115 [inline] __x64_sys_fsopen+0xeb/0x230 fs/fsopen.c:115 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 9844: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822 destroy_mount_options fs/ceph/super.c:630 [inline] destroy_mount_options+0x135/0x1b0 fs/ceph/super.c:618 destroy_fs_client+0x1b6/0x2b0 fs/ceph/super.c:894 deactivate_locked_super+0xa0/0x2d0 fs/super.c:454 ceph_get_tree+0x1307/0x1a10 fs/ceph/super.c:1353 vfs_get_tree+0x8c/0x370 fs/super.c:1713 vfs_cmd_create+0x11f/0x2f0 fs/fsopen.c:230 vfs_fsconfig_locked fs/fsopen.c:294 [inline] __do_sys_fsconfig+0x832/0xb90 fs/fsopen.c:475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3372 cfg80211_update_known_bss+0x821/0xa80 net/wireless/scan.c:1744 __cfg80211_bss_update+0x1ba/0x2540 net/wireless/scan.c:1788 cfg80211_inform_single_bss_frame_data+0x7e7/0xf30 net/wireless/scan.c:2881 cfg80211_inform_bss_frame_data+0xbf/0x290 net/wireless/scan.c:2912 ieee80211_bss_info_update+0x37b/0x9a0 net/mac80211/scan.c:211 ieee80211_rx_bss_info net/mac80211/ibss.c:1124 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline] ieee80211_ibss_rx_queued_mgmt+0x195f/0x2ee0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1604 [inline] ieee80211_iface_work+0xa1f/0xd40 net/mac80211/iface.c:1658 cfg80211_wiphy_work+0x24e/0x330 net/wireless/core.c:435 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 kvfree_call_rcu+0x70/0xbe0 kernel/rcu/tree.c:3372 cfg80211_update_known_bss+0x821/0xa80 net/wireless/scan.c:1744 __cfg80211_bss_update+0x1ba/0x2540 net/wireless/scan.c:1788 cfg80211_inform_single_bss_frame_data+0x7e7/0xf30 net/wireless/scan.c:2881 cfg80211_inform_bss_frame_data+0xbf/0x290 net/wireless/scan.c:2912 ieee80211_bss_info_update+0x37b/0x9a0 net/mac80211/scan.c:211 ieee80211_rx_bss_info net/mac80211/ibss.c:1124 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline] ieee80211_ibss_rx_queued_mgmt+0x195f/0x2ee0 net/mac80211/ibss.c:1642 ieee80211_iface_process_skb net/mac80211/iface.c:1604 [inline] ieee80211_iface_work+0xa1f/0xd40 net/mac80211/iface.c:1658 cfg80211_wiphy_work+0x24e/0x330 net/wireless/core.c:435 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 kthread+0x33a/0x430 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff88807983b000 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of freed 96-byte region [ffff88807983b000, ffff88807983b060) The buggy address belongs to the physical page: page:ffffea0001e60ec0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7983b flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888012c41780 ffffea0001da9c40 dead000000000002 raw: 0000000000000000 0000000000200020 00000001ffffffff 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 0x12820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 5142, tgid 5142 (kworker/0:5), ts 250720818630, free_ts 250668992649 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530 prep_new_page mm/page_alloc.c:1537 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3213 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4469 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8be/0x1570 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x137/0x350 mm/slub.c:3517 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1114 kmalloc include/linux/slab.h:599 [inline] dst_cow_metrics_generic+0x4c/0x1f0 net/core/dst.c:180 dst_metrics_write_ptr include/net/dst.h:133 [inline] dst_metric_set include/net/dst.h:194 [inline] icmp6_dst_alloc+0x4a2/0x620 net/ipv6/route.c:3273 ndisc_send_skb+0x100c/0x1430 net/ipv6/ndisc.c:489 ndisc_send_ns+0xc7/0x140 net/ipv6/ndisc.c:667 addrconf_dad_work+0xc7f/0x13e0 net/ipv6/addrconf.c:4213 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1130 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2342 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2481 release_pages+0x32a/0x14e0 mm/swap.c:1042 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:98 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu mm/mmu_gather.c:300 [inline] tlb_finish_mmu+0x14b/0x6f0 mm/mmu_gather.c:392 exit_mmap+0x38b/0xa60 mm/mmap.c:3223 __mmput+0x12a/0x4d0 kernel/fork.c:1356 mmput+0x62/0x70 kernel/fork.c:1378 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b4/0x2a20 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807983af00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88807983af80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc >ffff88807983b000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88807983b080: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff88807983b100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================