netdev - Re: [syzbot] memory leak in cfg80211_inform_single_bss_frame

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Date:   Wed, 13 Jul 2022 03:35:06 -0700
From:   syzbot <syzbot+7a942657a255a9d9b18a@...kaller.appspotmail.com>
To:     code@...dh.me, davem@...emloft.net, johannes@...solutions.net,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in cfg80211_inform_single_bss_frame_data

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in regulatory_init_db

BUG: memory leak
unreferenced object 0xffff888145137a00 (size 64):
  comm "swapper/0", pid 1, jiffies 4294937939 (age 68.850s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    ff ff ff ff 00 00 00 00 00 00 00 00 30 30 00 00  ............00..
  backtrace:
    [<ffffffff86ff026b>] kmalloc include/linux/slab.h:600 [inline]
    [<ffffffff86ff026b>] kzalloc include/linux/slab.h:733 [inline]
    [<ffffffff86ff026b>] regulatory_hint_core net/wireless/reg.c:3216 [inline]
    [<ffffffff86ff026b>] regulatory_init_db+0x22f/0x2de net/wireless/reg.c:4277
    [<ffffffff81000fe3>] do_one_initcall+0x63/0x2e0 init/main.c:1295
    [<ffffffff86f4eb10>] do_initcall_level init/main.c:1368 [inline]
    [<ffffffff86f4eb10>] do_initcalls init/main.c:1384 [inline]
    [<ffffffff86f4eb10>] do_basic_setup init/main.c:1403 [inline]
    [<ffffffff86f4eb10>] kernel_init_freeable+0x255/0x2cf init/main.c:1610
    [<ffffffff845b427a>] kernel_init+0x1a/0x1c0 init/main.c:1499
    [<ffffffff8100225f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

BUG: memory leak
unreferenced object 0xffff88810a760180 (size 96):
  comm "kworker/u4:2", pid 43, jiffies 4294943904 (age 9.220s)
  hex dump (first 32 bytes):
    fa fd 93 53 ad e3 05 00 00 00 00 00 00 00 00 00  ...S............
    00 00 00 00 00 00 00 00 28 00 00 00 01 00 06 10  ........(.......
  backtrace:
    [<ffffffff840740b6>] cfg80211_inform_single_bss_frame_data+0x186/0x6a0 net/wireless/scan.c:2445
    [<ffffffff8407461b>] cfg80211_inform_bss_frame_data+0x4b/0x460 net/wireless/scan.c:2506
    [<ffffffff84115816>] ieee80211_bss_info_update+0x196/0x440 net/mac80211/scan.c:190
    [<ffffffff841240e2>] ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline]
    [<ffffffff841240e2>] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline]
    [<ffffffff841240e2>] ieee80211_ibss_rx_queued_mgmt+0x7d2/0x11a0 net/mac80211/ibss.c:1639
    [<ffffffff84126b81>] ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline]
    [<ffffffff84126b81>] ieee80211_iface_work+0x601/0x780 net/mac80211/iface.c:1581
    [<ffffffff8127130f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2289
    [<ffffffff81271c39>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436
    [<ffffffff8127b955>] kthread+0x125/0x160 kernel/kthread.c:376
    [<ffffffff8100225f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

BUG: memory leak
unreferenced object 0xffff88810a760100 (size 96):
  comm "kworker/u4:0", pid 8, jiffies 4294943986 (age 8.400s)
  hex dump (first 32 bytes):
    36 80 a0 53 ad e3 05 00 00 00 00 00 00 00 00 00  6..S............
    00 00 00 00 00 00 00 00 28 00 00 00 01 00 06 10  ........(.......
  backtrace:
    [<ffffffff840740b6>] cfg80211_inform_single_bss_frame_data+0x186/0x6a0 net/wireless/scan.c:2445
    [<ffffffff8407461b>] cfg80211_inform_bss_frame_data+0x4b/0x460 net/wireless/scan.c:2506
    [<ffffffff84115816>] ieee80211_bss_info_update+0x196/0x440 net/mac80211/scan.c:190
    [<ffffffff841240e2>] ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline]
    [<ffffffff841240e2>] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline]
    [<ffffffff841240e2>] ieee80211_ibss_rx_queued_mgmt+0x7d2/0x11a0 net/mac80211/ibss.c:1639
    [<ffffffff84126b81>] ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline]
    [<ffffffff84126b81>] ieee80211_iface_work+0x601/0x780 net/mac80211/iface.c:1581
    [<ffffffff8127130f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2289
    [<ffffffff81271c39>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436
    [<ffffffff8127b955>] kthread+0x125/0x160 kernel/kthread.c:376
    [<ffffffff8100225f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

BUG: memory leak
unreferenced object 0xffff888114cb9100 (size 96):
  comm "kworker/u4:3", pid 53, jiffies 4294944017 (age 8.090s)
  hex dump (first 32 bytes):
    95 32 a5 53 ad e3 05 00 00 00 00 00 00 00 00 00  .2.S............
    00 00 00 00 00 00 00 00 28 00 00 00 01 00 06 10  ........(.......
  backtrace:
    [<ffffffff840740b6>] cfg80211_inform_single_bss_frame_data+0x186/0x6a0 net/wireless/scan.c:2445
    [<ffffffff8407461b>] cfg80211_inform_bss_frame_data+0x4b/0x460 net/wireless/scan.c:2506
    [<ffffffff84115816>] ieee80211_bss_info_update+0x196/0x440 net/mac80211/scan.c:190
    [<ffffffff841240e2>] ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline]
    [<ffffffff841240e2>] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline]
    [<ffffffff841240e2>] ieee80211_ibss_rx_queued_mgmt+0x7d2/0x11a0 net/mac80211/ibss.c:1639
    [<ffffffff84126b81>] ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline]
    [<ffffffff84126b81>] ieee80211_iface_work+0x601/0x780 net/mac80211/iface.c:1581
    [<ffffffff8127130f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2289
    [<ffffffff81271c39>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436
    [<ffffffff8127b955>] kthread+0x125/0x160 kernel/kthread.c:376
    [<ffffffff8100225f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

BUG: memory leak
unreferenced object 0xffff888114afa500 (size 96):
  comm "kworker/u4:3", pid 53, jiffies 4294944037 (age 7.890s)
  hex dump (first 32 bytes):
    1c 46 a8 53 ad e3 05 00 00 00 00 00 00 00 00 00  .F.S............
    00 00 00 00 00 00 00 00 28 00 00 00 01 00 06 10  ........(.......
  backtrace:
    [<ffffffff840740b6>] cfg80211_inform_single_bss_frame_data+0x186/0x6a0 net/wireless/scan.c:2445
    [<ffffffff8407461b>] cfg80211_inform_bss_frame_data+0x4b/0x460 net/wireless/scan.c:2506
    [<ffffffff84115816>] ieee80211_bss_info_update+0x196/0x440 net/mac80211/scan.c:190
    [<ffffffff841240e2>] ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline]
    [<ffffffff841240e2>] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline]
    [<ffffffff841240e2>] ieee80211_ibss_rx_queued_mgmt+0x7d2/0x11a0 net/mac80211/ibss.c:1639
    [<ffffffff84126b81>] ieee80211_iface_process_skb net/mac80211/iface.c:1527 [inline]
    [<ffffffff84126b81>] ieee80211_iface_work+0x601/0x780 net/mac80211/iface.c:1581
    [<ffffffff8127130f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2289
    [<ffffffff81271c39>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2436
    [<ffffffff8127b955>] kthread+0x125/0x160 kernel/kthread.c:376
    [<ffffffff8100225f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

[   75.59820


Tested on:

commit:         b047602d Merge tag 'trace-v5.19-rc5' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10cfa478080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=689b5fe7168a1260
dashboard link: https://syzkaller.appspot.com/bug?extid=7a942657a255a9d9b18a
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.