protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 ================================================================== 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 ffff888095ddf78b by task syz-executor0/27404 CPU: 0 PID: 27404 Comm: syz-executor0 Not tainted 4.20.0+ #3 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:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443 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+0x2753/0x6830 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:00007f0ecd1b5c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9 RDX: 000000000000004c RSI: 0000000020000180 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0ecd1b66d4 R13: 00000000004c53f5 R14: 00000000004d8ef0 R15: 00000000ffffffff Allocated by task 7305: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x700 mm/slab.c:3554 ptlock_alloc mm/memory.c:4555 [inline] ptlock_init include/linux/mm.h:1897 [inline] pgtable_pmd_page_ctor include/linux/mm.h:1991 [inline] pmd_alloc_one arch/x86/include/asm/pgalloc.h:112 [inline] __pmd_alloc+0xc9/0x460 mm/memory.c:4007 pmd_alloc+0x10c/0x180 include/linux/mm.h:1847 copy_pmd_range mm/memory.c:886 [inline] copy_pud_range mm/memory.c:940 [inline] copy_p4d_range mm/memory.c:962 [inline] copy_page_range+0x66d/0x2600 mm/memory.c:1024 dup_mmap kernel/fork.c:590 [inline] dup_mm kernel/fork.c:1323 [inline] copy_mm kernel/fork.c:1378 [inline] copy_process+0x4291/0x8730 kernel/fork.c:1922 _do_fork+0x1a9/0x1170 kernel/fork.c:2221 __do_sys_clone kernel/fork.c:2328 [inline] __se_sys_clone kernel/fork.c:2322 [inline] __x64_sys_clone+0xbf/0x150 kernel/fork.c:2322 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 27253: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3760 ptlock_free+0x38/0x42 mm/memory.c:4564 pgtable_pmd_page_dtor include/linux/mm.h:1999 [inline] ___pmd_free_tlb+0xb3/0x140 arch/x86/mm/pgtable.c:81 __pmd_free_tlb arch/x86/include/asm/pgalloc.h:131 [inline] free_pmd_range mm/memory.c:232 [inline] free_pud_range mm/memory.c:250 [inline] free_p4d_range mm/memory.c:284 [inline] free_pgd_range+0xb8c/0xed0 mm/memory.c:364 free_pgtables+0x236/0x2f0 mm/memory.c:396 exit_mmap+0x2e3/0x5d0 mm/mmap.c:3157 __mmput kernel/fork.c:1050 [inline] mmput+0x240/0x640 kernel/fork.c:1071 exec_mmap fs/exec.c:1043 [inline] flush_old_exec+0xb6d/0x21a0 fs/exec.c:1276 load_elf_binary+0xa76/0x53c0 fs/binfmt_elf.c:869 search_binary_handler fs/exec.c:1653 [inline] search_binary_handler+0x17f/0x570 fs/exec.c:1631 exec_binprm fs/exec.c:1695 [inline] __do_execve_file.isra.0+0x147f/0x2540 fs/exec.c:1819 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959 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 ffff888095ddf738 which belongs to the cache page->ptl of size 56 The buggy address is located 27 bytes to the right of 56-byte region [ffff888095ddf738, ffff888095ddf770) The buggy address belongs to the page: page:ffffea00025777c0 count:1 mapcount:0 mapping:ffff88812c3eb0c0 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000247fec8 ffffea000280be88 ffff88812c3eb0c0 raw: 0000000000000000 ffff888095ddf000 000000010000002e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888095ddf680: fc fb fb fb fb fb fb fb fc fc fc fc fb fb fb fb ffff888095ddf700: fb fb fb fc fc fc fc fb fb fb fb fb fb fb fc fc >ffff888095ddf780: fc fc fb fb fb fb fb fb fb fc fc fc fc fb fb fb ^ ffff888095ddf800: fb fb fb fb fc fc fc fc fb fb fb fb fb fb fb fc ffff888095ddf880: fc fc fc fb fb fb fb fb fb fb fc fc fc fc fb fb ==================================================================