================================================================== BUG: KASAN: slab-out-of-bounds in ether_addr_equal include/linux/etherdevice.h:322 [inline] BUG: KASAN: slab-out-of-bounds in ether_addr_equal_unaligned include/linux/etherdevice.h:376 [inline] BUG: KASAN: slab-out-of-bounds in batadv_compare_eth net/batman-adv/main.h:283 [inline] BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x1288/0x14a0 net/batman-adv/soft-interface.c:272 Read of size 4 at addr ffff8880a86c4fff by task syz-executor3/19533 CPU: 0 PID: 19533 Comm: syz-executor3 Not tainted 5.0.0-rc4+ #45 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 ether_addr_equal include/linux/etherdevice.h:322 [inline] ether_addr_equal_unaligned include/linux/etherdevice.h:376 [inline] batadv_compare_eth net/batman-adv/main.h:283 [inline] batadv_interface_tx+0x1288/0x14a0 net/batman-adv/soft-interface.c:272 __netdev_start_xmit include/linux/netdevice.h:4385 [inline] netdev_start_xmit include/linux/netdevice.h:4394 [inline] dev_direct_xmit+0x346/0x640 net/core/dev.c:3930 packet_direct_xmit+0xfb/0x170 net/packet/af_packet.c:246 packet_snd net/packet/af_packet.c:2933 [inline] packet_sendmsg+0x3879/0x5ab0 net/packet/af_packet.c:2958 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 sock_write_iter+0x27c/0x3e0 net/socket.c:922 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x613/0x8e0 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f98aaf8cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39 RDX: 000000000000000e RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f98aaf8d6d4 R13: 00000000004c3b8d R14: 00000000004dc278 R15: 00000000ffffffff Allocated by task 15695: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 __do_kmalloc_node mm/slab.c:3673 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3687 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:140 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1011 [inline] alloc_skb_with_frags+0x93/0x580 net/core/skbuff.c:5283 sock_alloc_send_pskb+0x72d/0x8a0 net/core/sock.c:2186 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2203 __ip6_append_data.isra.0+0x214c/0x3600 net/ipv6/ip6_output.c:1443 ip6_make_skb+0x32f/0x570 net/ipv6/ip6_output.c:1806 udpv6_sendmsg+0x216f/0x28b0 net/ipv6/udp.c:1468 inet_sendmsg+0x147/0x5d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 ___sys_sendmsg+0x3e2/0x930 net/socket.c:2138 __sys_sendmmsg+0x1c3/0x4e0 net/socket.c:2233 __do_sys_sendmmsg net/socket.c:2262 [inline] __se_sys_sendmmsg net/socket.c:2259 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2259 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 15684: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 skb_free_head+0x93/0xb0 net/core/skbuff.c:553 skb_release_data+0x57e/0x7b0 net/core/skbuff.c:573 __consume_stateless_skb+0x6e/0x2e0 net/core/skbuff.c:715 skb_consume_udp net/ipv4/udp.c:1540 [inline] skb_consume_udp+0x134/0x2a0 net/ipv4/udp.c:1523 udpv6_recvmsg+0xd44/0x1820 net/ipv6/udp.c:394 inet_recvmsg+0x13b/0x5f0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec+0x8c/0xb0 net/socket.c:816 ___sys_recvmsg+0x273/0x5d0 net/socket.c:2300 do_recvmmsg+0x27c/0x7a0 net/socket.c:2413 __sys_recvmmsg+0x259/0x270 net/socket.c:2492 __do_sys_recvmmsg net/socket.c:2515 [inline] __se_sys_recvmmsg net/socket.c:2508 [inline] __x64_sys_recvmmsg+0xe6/0x140 net/socket.c:2508 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a86c4d40 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 191 bytes to the right of 512-byte region [ffff8880a86c4d40, ffff8880a86c4f40) The buggy address belongs to the page: page:ffffea0002a1b100 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0xffff8880a86c45c0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000277dc08 ffffea00026acfc8 ffff88812c3f0940 raw: ffff8880a86c45c0 ffff8880a86c40c0 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a86c4e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a86c4f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8880a86c4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a86c5000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a86c5080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== kobject: 'loop4' (00000000db5288c7): fill_kobj_path: path = '/devices/virtual/block/loop4'