================================================================== BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x1194/0x1880 net/batman-adv/soft-interface.c:226 Read of size 2 at addr ffff888098865c8b by task syz-executor5/16915 CPU: 1 PID: 16915 Comm: syz-executor5 Not tainted 5.0.0-rc3+ #20 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kernel msg: ebtables bug: please report to author: counter_offset != totalcnt Call Trace: kernel msg: ebtables bug: please report to author: counter_offset != totalcnt __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 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_load_n_noabort+0xf/0x20 mm/kasan/generic_report.c:145 batadv_interface_tx+0x1194/0x1880 net/batman-adv/soft-interface.c:226 __netdev_start_xmit include/linux/netdevice.h:4385 [inline] netdev_start_xmit include/linux/netdevice.h:4394 [inline] dev_direct_xmit+0x368/0x670 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+0x27fb/0x6920 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+0x379/0x5e0 net/socket.c:900 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 kernel msg: ebtables bug: please report to author: counter_offset != totalcnt kernel msg: ebtables bug: please report to author: counter_offset != totalcnt vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f90e28a5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 000000000000000e RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f90e28a66d4 R13: 00000000004c3e13 R14: 00000000004dc4f8 R15: 00000000ffffffff Allocated by task 7836: 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 mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 user_path_at_empty+0x2f/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x129/0x210 fs/stat.c:185 vfs_lstat include/linux/fs.h:3175 [inline] __do_sys_newlstat+0xa4/0x130 fs/stat.c:352 __se_sys_newlstat fs/stat.c:346 [inline] __x64_sys_newlstat+0x54/0x80 fs/stat.c:346 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7836: 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] kmem_cache_free+0x86/0x260 mm/slab.c:3749 putname+0xef/0x130 fs/namei.c:261 filename_lookup+0x359/0x530 fs/namei.c:2357 user_path_at_empty+0x43/0x50 fs/namei.c:2608 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0x129/0x210 fs/stat.c:185 vfs_lstat include/linux/fs.h:3175 [inline] __do_sys_newlstat+0xa4/0x130 fs/stat.c:352 __se_sys_newlstat fs/stat.c:346 [inline] __x64_sys_newlstat+0x54/0x80 fs/stat.c:346 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888098864100 which belongs to the cache names_cache of size 4096 The buggy address is located 2955 bytes to the right of 4096-byte region [ffff888098864100, ffff888098865100) The buggy address belongs to the page: page:ffffea0002621900 count:1 mapcount:0 mapping:ffff88821bc45380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001780508 ffffea000280c108 ffff88821bc45380 raw: 0000000000000000 ffff888098864100 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098865b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098865c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888098865c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888098865d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098865d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================