Message-ID: <0000000000008c5b8c05ff934a6c@google.com>
Date:   Mon, 03 Jul 2023 04:15:59 -0700
From:   syzbot <syzbot+be9c824e6f269d608288@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com, glider@...gle.com,
        johannes@...solutions.net, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] [wireless?] KMSAN: uninit-value in ieee80211_rx_handlers

Hello,

syzbot found the following issue on:

HEAD commit:    257152fe29be string: use __builtin_memcpy() in strlcpy/str..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=13ba5e6f280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c7bdd043d54243c
dashboard link: https://syzkaller.appspot.com/bug?extid=be9c824e6f269d608288
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/43dcd4dfe7e1/disk-257152fe.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f3fcd9dec66c/vmlinux-257152fe.xz
kernel image: https://storage.googleapis.com/syzbot-assets/08620f02113d/bzImage-257152fe.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+be9c824e6f269d608288@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in ieee80211_rx_h_action net/mac80211/rx.c:3716 [inline]
BUG: KMSAN: uninit-value in ieee80211_rx_handlers+0xccf5/0x10320 net/mac80211/rx.c:4110
 ieee80211_rx_h_action net/mac80211/rx.c:3716 [inline]
 ieee80211_rx_handlers+0xccf5/0x10320 net/mac80211/rx.c:4110
 ieee80211_invoke_rx_handlers net/mac80211/rx.c:4145 [inline]
 ieee80211_prepare_and_rx_handle+0x563e/0x9620 net/mac80211/rx.c:4987
 ieee80211_rx_for_interface+0x88d/0x990 net/mac80211/rx.c:5072
 __ieee80211_rx_handle_packet net/mac80211/rx.c:5229 [inline]
 ieee80211_rx_list+0x5737/0x6550 net/mac80211/rx.c:5364
 ieee80211_rx_napi+0x87/0x350 net/mac80211/rx.c:5387
 ieee80211_rx include/net/mac80211.h:4918 [inline]
 ieee80211_tasklet_handler+0x1a0/0x310 net/mac80211/main.c:316
 tasklet_action_common+0x391/0xd30 kernel/softirq.c:798
 tasklet_action+0x26/0x30 kernel/softirq.c:823
 __do_softirq+0x1b7/0x78f kernel/softirq.c:571
 do_softirq+0x10d/0x190 kernel/softirq.c:472
 __local_bh_enable_ip+0x99/0xa0 kernel/softirq.c:396
 local_bh_enable+0x28/0x30 include/linux/bottom_half.h:33
 __ieee80211_tx_skb_tid_band+0x276/0x560 net/mac80211/tx.c:6057
 ieee80211_tx_skb_tid+0x203/0x290 net/mac80211/tx.c:6084
 ieee80211_mgmt_tx+0x1cff/0x2070 net/mac80211/offchannel.c:965
 rdev_mgmt_tx net/wireless/rdev-ops.h:746 [inline]
 cfg80211_mlme_mgmt_tx+0x133b/0x1ba0 net/wireless/mlme.c:815
 nl80211_tx_mgmt+0x1297/0x1840 net/wireless/nl80211.c:12594
 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
 genl_rcv_msg+0x12ed/0x1380 net/netlink/genetlink.c:1065
 netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2546
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0xf28/0x1230 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x122f/0x13d0 net/netlink/af_netlink.c:1913
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x999/0xd50 net/socket.c:2503
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2557
 __sys_sendmsg+0x222/0x3c0 net/socket.c:2586
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0x9d/0xe0 net/compat.c:350
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was stored to memory at:
 skb_copy_from_linear_data_offset include/linux/skbuff.h:4088 [inline]
 skb_copy_bits+0x149/0xd30 net/core/skbuff.c:2758
 skb_copy+0x47f/0xa00 net/core/skbuff.c:1948
 mac80211_hwsim_tx_frame_no_nl+0x18db/0x2130 drivers/net/wireless/virtual/mac80211_hwsim.c:1835
 mac80211_hwsim_tx+0x1a9b/0x2a10 drivers/net/wireless/virtual/mac80211_hwsim.c:2046
 drv_tx net/mac80211/driver-ops.h:35 [inline]
 ieee80211_tx_frags+0x5e7/0xd90 net/mac80211/tx.c:1752
 __ieee80211_tx+0x46e/0x630 net/mac80211/tx.c:1806
 ieee80211_tx+0x52e/0x570 net/mac80211/tx.c:1986
 ieee80211_xmit+0x54a/0x5b0 net/mac80211/tx.c:2078
 __ieee80211_tx_skb_tid_band+0x271/0x560 net/mac80211/tx.c:6056
 ieee80211_tx_skb_tid+0x203/0x290 net/mac80211/tx.c:6084
 ieee80211_mgmt_tx+0x1cff/0x2070 net/mac80211/offchannel.c:965
 rdev_mgmt_tx net/wireless/rdev-ops.h:746 [inline]
 cfg80211_mlme_mgmt_tx+0x133b/0x1ba0 net/wireless/mlme.c:815
 nl80211_tx_mgmt+0x1297/0x1840 net/wireless/nl80211.c:12594
 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
 genl_rcv_msg+0x12ed/0x1380 net/netlink/genetlink.c:1065
 netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2546
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0xf28/0x1230 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x122f/0x13d0 net/netlink/af_netlink.c:1913
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x999/0xd50 net/socket.c:2503
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2557
 __sys_sendmsg+0x222/0x3c0 net/socket.c:2586
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0x9d/0xe0 net/compat.c:350
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 slab_post_alloc_hook+0x12d/0xb60 mm/slab.h:716
 slab_alloc_node mm/slub.c:3451 [inline]
 kmem_cache_alloc_node+0x535/0xa30 mm/slub.c:3496
 kmalloc_reserve+0x148/0x470 net/core/skbuff.c:568
 __alloc_skb+0x318/0x740 net/core/skbuff.c:654
 __netdev_alloc_skb+0x11a/0x6f0 net/core/skbuff.c:718
 netdev_alloc_skb include/linux/skbuff.h:3204 [inline]
 dev_alloc_skb include/linux/skbuff.h:3217 [inline]
 ieee80211_mgmt_tx+0x1316/0x2070 net/mac80211/offchannel.c:907
 rdev_mgmt_tx net/wireless/rdev-ops.h:746 [inline]
 cfg80211_mlme_mgmt_tx+0x133b/0x1ba0 net/wireless/mlme.c:815
 nl80211_tx_mgmt+0x1297/0x1840 net/wireless/nl80211.c:12594
 genl_family_rcv_msg_doit net/netlink/genetlink.c:968 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
 genl_rcv_msg+0x12ed/0x1380 net/netlink/genetlink.c:1065
 netlink_rcv_skb+0x371/0x650 net/netlink/af_netlink.c:2546
 genl_rcv+0x40/0x60 net/netlink/genetlink.c:1076
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0xf28/0x1230 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x122f/0x13d0 net/netlink/af_netlink.c:1913
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg net/socket.c:747 [inline]
 ____sys_sendmsg+0x999/0xd50 net/socket.c:2503
 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2557
 __sys_sendmsg+0x222/0x3c0 net/socket.c:2586
 __compat_sys_sendmsg net/compat.c:346 [inline]
 __do_compat_sys_sendmsg net/compat.c:353 [inline]
 __se_compat_sys_sendmsg net/compat.c:350 [inline]
 __ia32_compat_sys_sendmsg+0x9d/0xe0 net/compat.c:350
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

CPU: 0 PID: 5275 Comm: syz-executor.5 Not tainted 6.4.0-syzkaller-g257152fe29be #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
=====================================================


---
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If the bug is already fixed, let syzbot know by replying with:
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