================================================================== BUG: KASAN: use-after-free in vxlan_vnifilter_dump_dev+0x9a0/0xb40 drivers/net/vxlan/vxlan_vnifilter.c:349 Read of size 4 at addr ffff88814be18e70 by task syz-executor225/3696 CPU: 1 PID: 3696 Comm: syz-executor225 Tainted: G W 5.17.0-syzkaller-10107-gd717e4cae0fe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 vxlan_vnifilter_dump_dev+0x9a0/0xb40 drivers/net/vxlan/vxlan_vnifilter.c:349 vxlan_vnifilter_dump+0x3ff/0x650 drivers/net/vxlan/vxlan_vnifilter.c:428 netlink_dump+0x4b5/0xb70 net/netlink/af_netlink.c:2270 __netlink_dump_start+0x647/0x900 net/netlink/af_netlink.c:2375 netlink_dump_start include/linux/netlink.h:245 [inline] rtnetlink_rcv_msg+0x70c/0xb80 net/core/rtnetlink.c:5953 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x6e2/0x800 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2496 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f5905eae6a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeaf4d5f08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5905eae6a9 RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d R10: 000000000000000d R11: 0000000000000246 R12: 00007ffeaf4d5f20 R13: 00000000000f4240 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 1: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] bpf_check+0x137/0xbb20 kernel/bpf/verifier.c:14375 bpf_prog_load+0xfb2/0x2250 kernel/bpf/syscall.c:2351 __sys_bpf+0x674/0x55d0 kernel/bpf/syscall.c:4663 ____bpf_sys_bpf kernel/bpf/syscall.c:4825 [inline] bpf_sys_bpf+0x195/0x5b0 kernel/bpf/syscall.c:4782 skel_sys_bpf tools/lib/bpf/skel_internal.h:75 [inline] bpf_load_and_run.constprop.0+0x2be/0x48a tools/lib/bpf/skel_internal.h:316 iterators_bpf__load kernel/bpf/preload/iterators/iterators.lskel.h:400 [inline] load_skel kernel/bpf/preload/bpf_preload_kern.c:41 [inline] load+0x230/0x723 kernel/bpf/preload/bpf_preload_kern.c:74 do_one_initcall+0x103/0x650 init/main.c:1298 do_initcall_level init/main.c:1371 [inline] do_initcalls init/main.c:1387 [inline] do_basic_setup init/main.c:1406 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1613 kernel_init+0x1a/0x1d0 init/main.c:1502 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 The buggy address belongs to the object at ffff88814be18000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 3696 bytes inside of 8192-byte region [ffff88814be18000, ffff88814be1a000) The buggy address belongs to the physical page: page:ffffea00052f8600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88814be18000 pfn:0x14be18 head:ffffea00052f8600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 ffffea00052f4808 ffffea0005212c08 ffff888010c42280 raw: ffff88814be18000 0000000000020000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 10809609869, free_ts 0 prep_new_page mm/page_alloc.c:2438 [inline] get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4179 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5405 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2107 alloc_pages+0x2b1/0x310 mm/mempolicy.c:2257 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0x8df/0xf20 mm/slub.c:3005 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092 slab_alloc_node mm/slub.c:3183 [inline] slab_alloc mm/slub.c:3225 [inline] kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3256 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] bpf_check+0x137/0xbb20 kernel/bpf/verifier.c:14375 bpf_prog_load+0xfb2/0x2250 kernel/bpf/syscall.c:2351 __sys_bpf+0x674/0x55d0 kernel/bpf/syscall.c:4663 ____bpf_sys_bpf kernel/bpf/syscall.c:4825 [inline] bpf_sys_bpf+0x195/0x5b0 kernel/bpf/syscall.c:4782 skel_sys_bpf tools/lib/bpf/skel_internal.h:75 [inline] bpf_load_and_run.constprop.0+0x2be/0x48a tools/lib/bpf/skel_internal.h:316 iterators_bpf__load kernel/bpf/preload/iterators/iterators.lskel.h:400 [inline] load_skel kernel/bpf/preload/bpf_preload_kern.c:41 [inline] load+0x230/0x723 kernel/bpf/preload/bpf_preload_kern.c:74 do_one_initcall+0x103/0x650 init/main.c:1298 do_initcall_level init/main.c:1371 [inline] do_initcalls init/main.c:1387 [inline] do_basic_setup init/main.c:1406 [inline] kernel_init_freeable+0x6b1/0x73a init/main.c:1613 page_owner free stack trace missing Memory state around the buggy address: ffff88814be18d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814be18d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88814be18e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88814be18e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88814be18f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================