================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: slab-use-after-free in mapping_release_always include/linux/pagemap.h:279 [inline] BUG: KASAN: slab-use-after-free in folio_needs_release mm/internal.h:187 [inline] BUG: KASAN: slab-use-after-free in shrink_folio_list+0x2dbf/0x3e60 mm/vmscan.c:2067 Read of size 8 at addr ffff888085ff40d1 by task syz-executor.0/15385 CPU: 0 PID: 15385 Comm: syz-executor.0 Not tainted 6.4.0-next-20230707-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xf0/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] mapping_release_always include/linux/pagemap.h:279 [inline] folio_needs_release mm/internal.h:187 [inline] shrink_folio_list+0x2dbf/0x3e60 mm/vmscan.c:2067 reclaim_folio_list+0xd0/0x390 mm/vmscan.c:2801 reclaim_pages+0x442/0x670 mm/vmscan.c:2837 madvise_cold_or_pageout_pte_range+0x13e4/0x1ee0 mm/madvise.c:430 walk_pmd_range mm/pagewalk.c:140 [inline] walk_pud_range mm/pagewalk.c:218 [inline] walk_p4d_range mm/pagewalk.c:253 [inline] walk_pgd_range+0x9e7/0x1470 mm/pagewalk.c:290 __walk_page_range+0x651/0x780 mm/pagewalk.c:392 walk_page_range+0x311/0x4a0 mm/pagewalk.c:490 madvise_pageout_page_range mm/madvise.c:591 [inline] madvise_pageout+0x2fe/0x560 mm/madvise.c:618 madvise_vma_behavior+0x61a/0x21a0 mm/madvise.c:1039 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1268 do_madvise.part.0+0x276/0x490 mm/madvise.c:1448 do_madvise mm/madvise.c:1461 [inline] __do_sys_madvise mm/madvise.c:1461 [inline] __se_sys_madvise mm/madvise.c:1459 [inline] __x64_sys_madvise+0x117/0x150 mm/madvise.c:1459 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fd731e8c389 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd732c77168 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fd731fabf80 RCX: 00007fd731e8c389 RDX: 0000000000000015 RSI: 0000000000800000 RDI: 0000000020000000 RBP: 00007fd731ed7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0245252f R14: 00007fd732c77300 R15: 0000000000022000 Allocated by task 5370: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] kmem_cache_alloc_node+0x1cd/0x3f0 mm/slub.c:3515 kmalloc_reserve+0x165/0x270 net/core/skbuff.c:559 __alloc_skb+0x129/0x330 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1289 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1211 [inline] netlink_sendmsg+0x9b0/0xe30 net/netlink/af_netlink.c:1889 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xde/0x190 net/socket.c:748 ____sys_sendmsg+0x739/0x920 net/socket.c:2494 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2548 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2577 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888085ff4000 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 209 bytes inside of freed 640-byte region [ffff888085ff4000, ffff888085ff4280) The buggy address belongs to the physical page: page:ffffea000217fd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888085ff4300 pfn:0x85ff4 head:ffffea000217fd00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff888142250780 ffffea0000aa5010 ffffea000057e810 raw: ffff888085ff4300 0000000000150011 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 0, tgid 0 (swapper/0), ts 740699448996, free_ts 636351671181 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1569 prep_new_page mm/page_alloc.c:1576 [inline] get_page_from_freelist+0xfd9/0x2c40 mm/page_alloc.c:3256 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4512 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x25f/0x390 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] kmem_cache_alloc_node+0x13e/0x3f0 mm/slub.c:3515 kmalloc_reserve+0x165/0x270 net/core/skbuff.c:559 __alloc_skb+0x129/0x330 net/core/skbuff.c:644 skb_copy+0x13d/0x3e0 net/core/skbuff.c:1925 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb02/0x1290 drivers/net/wireless/virtual/mac80211_hwsim.c:1836 mac80211_hwsim_tx_frame+0x1ee/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2172 mac80211_hwsim_beacon_tx+0x431/0x750 drivers/net/wireless/virtual/mac80211_hwsim.c:2265 __iterate_interfaces+0x2c8/0x570 net/mac80211/util.c:766 ieee80211_iterate_active_interfaces_atomic+0x73/0x1c0 net/mac80211/util.c:802 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1160 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2383 free_unref_page+0x33/0x370 mm/page_alloc.c:2478 __unfreeze_partials+0x1fe/0x220 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x173/0x390 mm/slub.c:3494 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140 getname_flags+0x9e/0xe0 include/linux/audit.h:319 user_path_at_empty+0x2f/0x60 fs/namei.c:2906 do_readlinkat+0xcd/0x2f0 fs/stat.c:477 __do_sys_readlink fs/stat.c:510 [inline] __se_sys_readlink fs/stat.c:507 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:507 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888085ff3f80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888085ff4000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888085ff4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888085ff4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888085ff4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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