================================================================== BUG: KASAN: global-out-of-bounds in string_nocheck lib/vsprintf.c:611 [inline] BUG: KASAN: global-out-of-bounds in string+0x39c/0x3d0 lib/vsprintf.c:693 Read of size 1 at addr ffffffff8fc496e0 by task syz-executor.1/5664 CPU: 1 PID: 5664 Comm: syz-executor.1 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 string_nocheck lib/vsprintf.c:611 [inline] string+0x39c/0x3d0 lib/vsprintf.c:693 vsnprintf+0x71b/0x14f0 lib/vsprintf.c:2619 snprintf+0xbb/0xf0 lib/vsprintf.c:2752 smc_nl_get_sys_info+0x493/0x880 net/smc/smc_core.c:249 genl_lock_dumpit+0x60/0x90 net/netlink/genetlink.c:623 netlink_dump+0x4b9/0xb70 net/netlink/af_netlink.c:2268 __netlink_dump_start+0x642/0x900 net/netlink/af_netlink.c:2373 genl_family_rcv_msg_dumpit+0x2af/0x310 net/netlink/genetlink.c:686 genl_family_rcv_msg net/netlink/genetlink.c:780 [inline] genl_rcv_msg+0x434/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fabb0664c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffe1052ddbf R14: 00007fabb06659c0 R15: 000000000119bf8c The buggy address belongs to the variable: smc_hostname+0x20/0x40 Memory state around the buggy address: ffffffff8fc49580: 00 00 f9 f9 f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 ffffffff8fc49600: 00 00 f9 f9 f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 >ffffffff8fc49680: 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 f9 f9 f9 f9 ^ ffffffff8fc49700: 04 f9 f9 f9 f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 ffffffff8fc49780: 00 00 f9 f9 f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 ==================================================================