netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. ------------[ cut here ]------------ Trying to vfree() nonexistent vm area (ffffc90001b39000) WARNING: CPU: 0 PID: 14625 at mm/vmalloc.c:2267 __vunmap+0x150/0xb60 mm/vmalloc.c:2267 Modules linked in: CPU: 0 PID: 14625 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__vunmap+0x150/0xb60 mm/vmalloc.c:2267 Code: 85 78 ff ff ff e8 60 71 c6 ff 48 c7 c7 a0 81 08 8c e8 34 b2 57 07 e8 4f 71 c6 ff 4c 89 e6 48 c7 c7 00 3d 76 89 e8 bc 68 14 07 <0f> 0b 48 83 c4 38 5b 5d 41 5c 41 5d 41 5e 41 5f e9 2b 71 c6 ff e8 RSP: 0018:ffffc90001a772c8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000040000 RSI: ffffffff815c4cb5 RDI: fffff5200034ee4b RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815bda4e R11: 0000000000000000 R12: ffffc90001b39000 R13: ffff8880144c0240 R14: ffffc90001b50000 R15: ffffe8ffffc0aa20 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0063) knlGS:00000000f55c3b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000030623000 CR3: 0000000023a69000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __vfree+0x3c/0xd0 mm/vmalloc.c:2333 vfree+0x5a/0x90 mm/vmalloc.c:2364 ipcomp_free_scratches+0xc4/0x160 net/xfrm/xfrm_ipcomp.c:212 ipcomp_free_data net/xfrm/xfrm_ipcomp.c:321 [inline] ipcomp_init_state+0x77c/0xa40 net/xfrm/xfrm_ipcomp.c:373 ipcomp4_init_state+0xc2/0x8e0 net/ipv4/ipcomp.c:134 __xfrm_init_state+0x9ca/0x15b0 net/xfrm/xfrm_state.c:2607 xfrm_state_construct net/xfrm/xfrm_user.c:627 [inline] xfrm_add_sa+0x1ef1/0x35f0 net/xfrm/xfrm_user.c:684 xfrm_user_rcv_msg+0x42c/0x8b0 net/xfrm/xfrm_user.c:2812 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2824 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x90 arch/x86/entry/common.c:140 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:165 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fea549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55c35fc EFLAGS: 00000296 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000400 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000