syzbot has found a reproducer for the following issue on: HEAD commit: 73d62e81 kmsan: random: prevent boot-time reports in _mix_.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=153d4607500000 kernel config: https://syzkaller.appspot.com/x/.config?x=eef728deea880383 dashboard link: https://syzkaller.appspot.com/bug?extid=72b99dcf4607e8c770f3 compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c1cec3500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160b6cd3500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+72b99dcf4607e8c770f3@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in validate_beacon_head+0x51e/0x5c0 net/wireless/nl80211.c:225 CPU: 0 PID: 8275 Comm: syz-executor237 Not tainted 5.10.0-rc4-syzkaller #0 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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 validate_beacon_head+0x51e/0x5c0 net/wireless/nl80211.c:225 validate_nla lib/nlattr.c:544 [inline] __nla_validate_parse+0x241a/0x4e00 lib/nlattr.c:588 __nla_parse+0x141/0x150 lib/nlattr.c:685 __nlmsg_parse include/net/netlink.h:733 [inline] nlmsg_parse_deprecated include/net/netlink.h:772 [inline] nl80211_prepare_wdev_dump+0x6fd/0xbb0 net/wireless/nl80211.c:891 nl80211_dump_station+0x143/0x740 net/wireless/nl80211.c:5810 netlink_dump+0xb92/0x1670 net/netlink/af_netlink.c:2268 __netlink_dump_start+0xcf1/0xea0 net/netlink/af_netlink.c:2373 genl_family_rcv_msg_dumpit net/netlink/genetlink.c:697 [inline] genl_family_rcv_msg net/netlink/genetlink.c:780 [inline] genl_rcv_msg+0xff0/0x1610 net/netlink/genetlink.c:800 netlink_rcv_skb+0x70a/0x820 net/netlink/af_netlink.c:2494 genl_rcv+0x63/0x80 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x11da/0x14b0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x173c/0x1840 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmsg+0x6d5/0x830 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2447 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2447 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4418a9 Code: e8 fc a9 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 fb 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffe906479e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004418a9 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00000000006cc018 R08: 0000000000000000 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402430 R13: 00000000004024c0 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2906 [inline] __kmalloc_node_track_caller+0xc61/0x15f0 mm/slub.c:4512 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x309/0xae0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] netlink_alloc_large_skb net/netlink/af_netlink.c:1176 [inline] netlink_sendmsg+0xdb8/0x1840 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmsg+0x6d5/0x830 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2447 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2447 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xa9 =====================================================
