[syzbot] [wireless?] KMSAN: uninit-value in nl80211_send_pmsr_capa

[syzbot <syzbot+c686c6b197d10ff3a749@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    eb71ab2bf722 Merge tag 'bpf-fixes' of git://git.kernel.org..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b7d0ba580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=10f867da86e38691
dashboard link: https://syzkaller.appspot.com/bug?extid=c686c6b197d10ff3a749
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fcbe8b5437ef/disk-eb71ab2b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/245a6565a05b/vmlinux-eb71ab2b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a83b065baa80/bzImage-eb71ab2b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c686c6b197d10ff3a749@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in nl80211_send_pmsr_ftm_capa net/wireless/nl80211.c:2302 [inline]
BUG: KMSAN: uninit-value in nl80211_send_pmsr_capa+0x6fe/0x1b50 net/wireless/nl80211.c:2404
 nl80211_send_pmsr_ftm_capa net/wireless/nl80211.c:2302 [inline]
 nl80211_send_pmsr_capa+0x6fe/0x1b50 net/wireless/nl80211.c:2404
 nl80211_send_wiphy+0x1464/0x96d0 net/wireless/nl80211.c:3302
 nl80211_dump_wiphy+0x5b6/0xc80 net/wireless/nl80211.c:3447
 genl_dumpit+0x14e/0x2a0 net/netlink/genetlink.c:1026
 netlink_dump+0xbaa/0x1800 net/netlink/af_netlink.c:2325
 netlink_recvmsg+0xc8a/0xfe0 net/netlink/af_netlink.c:1976
 sock_recvmsg_nosec+0x23e/0x2e0 net/socket.c:1078
 ____sys_recvmsg+0x4e5/0x620 net/socket.c:2810
 ___sys_recvmsg+0x20b/0x850 net/socket.c:2854
 do_recvmmsg+0x40e/0xdf0 net/socket.c:2949
 __sys_recvmmsg net/socket.c:3023 [inline]
 __do_sys_recvmmsg net/socket.c:3046 [inline]
 __se_sys_recvmmsg net/socket.c:3039 [inline]
 __x64_sys_recvmmsg+0x383/0x500 net/socket.c:3039
 x64_sys_call+0x96d/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:300
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 mac80211_hwsim_new_radio+0x60b8/0x7e20 drivers/net/wireless/virtual/mac80211_hwsim.c:5837
 hwsim_new_radio_nl+0x1839/0x3160 drivers/net/wireless/virtual/mac80211_hwsim.c:6504
 genl_family_rcv_msg_doit+0x338/0x3f0 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0xac5/0xc00 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x54d/0x680 net/netlink/af_netlink.c:2550
 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x10b2/0x1250 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xfe7/0x1080 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681
 x64_sys_call+0x1e20/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4522 [inline]
 slab_alloc_node mm/slub.c:4844 [inline]
 __kmalloc_cache_noprof+0x35e/0x1260 mm/slub.c:5353
 kmalloc_noprof include/linux/slab.h:950 [inline]
 hwsim_new_radio_nl+0x1705/0x3160 drivers/net/wireless/virtual/mac80211_hwsim.c:6492
 genl_family_rcv_msg_doit+0x338/0x3f0 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0xac5/0xc00 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x54d/0x680 net/netlink/af_netlink.c:2550
 genl_rcv+0x41/0x60 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0xf04/0x12b0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x10b2/0x1250 net/netlink/af_netlink.c:1894
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg net/socket.c:742 [inline]
 ____sys_sendmsg+0xfe7/0x1080 net/socket.c:2592
 ___sys_sendmsg+0x271/0x3b0 net/socket.c:2646
 __sys_sendmsg net/socket.c:2678 [inline]
 __do_sys_sendmsg net/socket.c:2683 [inline]
 __se_sys_sendmsg net/socket.c:2681 [inline]
 __x64_sys_sendmsg+0x211/0x3e0 net/socket.c:2681
 x64_sys_call+0x1e20/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 15981 Comm: syz.5.4560 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
=====================================================


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup