================================================================== 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 ffff8880942b030b by task syz-executor0/25740 CPU: 1 PID: 25740 Comm: syz-executor0 Not tainted 4.20.0+ #19 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+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:4382 [inline] netdev_start_xmit include/linux/netdevice.h:4391 [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:2932 [inline] packet_sendmsg+0x2754/0x6860 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x387/0x5f0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 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:00007f49b23cfc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9 RDX: 000000000000004c RSI: 0000000020000180 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f49b23d06d4 R13: 00000000004c54ac R14: 00000000004d9158 R15: 00000000ffffffff Allocated by task 32678: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc mm/kasan/common.c:482 [inline] kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:397 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3541 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] inotify_find_inode+0x2e/0xe0 fs/notify/inotify/inotify_user.c:349 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:741 [inline] __se_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:696 [inline] __x64_sys_inotify_add_watch+0x21f/0x3b0 fs/notify/inotify/inotify_user.c:696 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 32678: 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:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3747 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] inotify_find_inode+0x2e/0xe0 fs/notify/inotify/inotify_user.c:349 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:741 [inline] __se_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:696 [inline] __x64_sys_inotify_add_watch+0x21f/0x3b0 fs/notify/inotify/inotify_user.c:696 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 ffff8880942b06c0 which belongs to the cache names_cache of size 4096 The buggy address is located 949 bytes to the left of 4096-byte region [ffff8880942b06c0, ffff8880942b16c0) The buggy address belongs to the page: page:ffffea000250ac00 count:1 mapcount:0 mapping:ffff88821bc49080 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001ae1c88 ffffea0001917c88 ffff88821bc49080 raw: 0000000000000000 ffff8880942b06c0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880942b0200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880942b0280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880942b0300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880942b0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880942b0400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================