Hello,
syzbot found the following crash on:
HEAD commit: f346b0becb1b Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10f0bbdd400000 kernel config: https://syzkaller.appspot.com/x/.config?x=c255c77ba370fe7c dashboard link: https://syzkaller.appspot.com/bug?extid=9d7405c7faa390e60b4e compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c3eabf400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=164bfbfb400000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+9d7405c7faa390e60b4e@syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x160a/0x18b0 net/batman-adv/soft-interface.c:226 Read of size 2 at addr ffff8880a662f5cb by task syz-executor922/8142
CPU: 0 PID: 8142 Comm: syz-executor922 Not tainted 4.20.0+ #173 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+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:187 kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/generic_report.c:145 batadv_interface_tx+0x160a/0x18b0 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+0x36c/0x6a0 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+0x298a/0x6ad0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 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+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441619 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0b fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd5c9334f8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441619 RDX: 000000000000000e RSI: 0000000020000180 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004025e0 R13: 0000000000402670 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 8184: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:397 kmem_cache_alloc+0x130/0x730 mm/slab.c:3541 getname_flags+0xd0/0x590 fs/namei.c:140 getname+0x19/0x20 fs/namei.c:211 do_sys_open+0x383/0x780 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 8184: save_stack+0x43/0xd0 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+0x83/0x290 mm/slab.c:3747 putname+0xf2/0x130 fs/namei.c:261 do_sys_open+0x54d/0x780 fs/open.c:1072 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a662e5c0 which belongs to the cache names_cache of size 4096 The buggy address is located 11 bytes to the right of 4096-byte region [ffff8880a662e5c0, ffff8880a662f5c0) The buggy address belongs to the page: page:ffffea0002998b80 count:1 mapcount:0 mapping:ffff88821bc48200 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00029fa208 ffffea00022fd188 ffff88821bc48200 raw: 0000000000000000 ffff8880a662e5c0 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8880a662f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a662f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880a662f580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^ ffff8880a662f600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a662f680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
--- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches