x_tables: ip6_tables: rpfilter match: used from hooks OUTPUT, but only valid from PREROUTING ================================================================== BUG: KASAN: slab-use-after-free in nla_ok include/net/netlink.h:1230 [inline] BUG: KASAN: slab-use-after-free in nla_find+0x120/0x130 lib/nlattr.c:746 Read of size 2 at addr ffff88801470d6b6 by task syz-executor.0/10351 CPU: 0 PID: 10351 Comm: syz-executor.0 Not tainted 6.7.0-rc5-syzkaller-01080-g3a3af3aedb00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 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 nla_ok include/net/netlink.h:1230 [inline] nla_find+0x120/0x130 lib/nlattr.c:746 nla_find_nested include/net/netlink.h:1260 [inline] ____bpf_skb_get_nlattr_nest net/core/filter.c:209 [inline] bpf_skb_get_nlattr_nest+0x178/0x1f0 net/core/filter.c:192 Allocated by task 5096: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x180/0x330 mm/slub.c:3523 kmalloc_reserve+0x166/0x260 net/core/skbuff.c:560 __alloc_skb+0x12b/0x330 net/core/skbuff.c:651 __netdev_alloc_skb+0x72/0x3f0 net/core/skbuff.c:715 netdev_alloc_skb include/linux/skbuff.h:3237 [inline] dev_alloc_skb include/linux/skbuff.h:3250 [inline] __ieee80211_beacon_get+0xc2a/0x16e0 net/mac80211/tx.c:5445 ieee80211_beacon_get_tim+0xa7/0x280 net/mac80211/tx.c:5567 ieee80211_beacon_get include/net/mac80211.h:5442 [inline] mac80211_hwsim_beacon_tx+0x3f6/0x740 drivers/net/wireless/virtual/mac80211_hwsim.c:2260 __iterate_interfaces+0x2d2/0x580 net/mac80211/util.c:767 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:803 mac80211_hwsim_beacon+0x101/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2290 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc20 kernel/time/hrtimer.c:1752 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1769 __do_softirq+0x21a/0x8de kernel/softirq.c:553 Freed by task 5096: 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+0xf8/0x350 mm/slub.c:3831 skb_kfree_head net/core/skbuff.c:984 [inline] skb_kfree_head net/core/skbuff.c:981 [inline] skb_free_head+0x17f/0x1b0 net/core/skbuff.c:998 skb_release_data+0x5ba/0x870 net/core/skbuff.c:1028 skb_release_all net/core/skbuff.c:1094 [inline] __kfree_skb net/core/skbuff.c:1108 [inline] consume_skb net/core/skbuff.c:1324 [inline] consume_skb+0xd2/0x170 net/core/skbuff.c:1318 mac80211_hwsim_tx_frame+0x1f3/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2172 mac80211_hwsim_beacon_tx+0x41b/0x740 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 __iterate_interfaces+0x2d2/0x580 net/mac80211/util.c:767 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:803 mac80211_hwsim_beacon+0x101/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2290 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc20 kernel/time/hrtimer.c:1752 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1769 __do_softirq+0x21a/0x8de kernel/softirq.c:553 The buggy address belongs to the object at ffff88801470d500 which belongs to the cache skbuff_small_head of size 640 The buggy address is located 438 bytes inside of freed 640-byte region [ffff88801470d500, ffff88801470d780) The buggy address belongs to the physical page: page:ffffea000051c300 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801470e700 pfn:0x1470c head:ffffea000051c300 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff88801b2568c0 ffffea0001f1f600 dead000000000004 raw: ffff88801470e700 0000000080150011 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 5096, tgid 5096 (syz-executor.5), ts 357985992298, free_ts 151692561593 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1544 prep_new_page mm/page_alloc.c:1551 [inline] get_page_from_freelist+0xa28/0x3730 mm/page_alloc.c:3319 __alloc_pages+0x22e/0x2420 mm/page_alloc.c:4575 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab mm/slub.c:2017 [inline] new_slab+0x283/0x3c0 mm/slub.c:2070 ___slab_alloc+0x979/0x1500 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+0x132/0x330 mm/slub.c:3523 kmalloc_reserve+0x166/0x260 net/core/skbuff.c:560 __alloc_skb+0x12b/0x330 net/core/skbuff.c:651 skb_copy+0x12c/0x2e0 net/core/skbuff.c:2017 mac80211_hwsim_tx_frame_no_nl.isra.0+0xb94/0x1300 drivers/net/wireless/virtual/mac80211_hwsim.c:1835 mac80211_hwsim_tx_frame+0x1eb/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2171 mac80211_hwsim_beacon_tx+0x41b/0x740 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 __iterate_interfaces+0x2d2/0x580 net/mac80211/util.c:767 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:803 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1144 [inline] free_unref_page_prepare+0x53c/0xb80 mm/page_alloc.c:2354 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2494 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook mm/slab.h:763 [inline] slab_alloc_node mm/slub.c:3478 [inline] __kmem_cache_alloc_node+0x195/0x310 mm/slub.c:3517 kmalloc_trace+0x25/0x60 mm/slab_common.c:1098 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:721 [inline] kernfs_fop_open+0x28b/0xd30 fs/kernfs/file.c:621 do_dentry_open+0x8d6/0x18c0 fs/open.c:948 do_open fs/namei.c:3622 [inline] path_openat+0x1e5a/0x2c50 fs/namei.c:3779 do_filp_open+0x1de/0x430 fs/namei.c:3809 do_sys_openat2+0x176/0x1e0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff88801470d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801470d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801470d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801470d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801470d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================