[syzbot] memory leak in mgmt_cmd_complete

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May 17, 2021, 5:12:17 AM5/17/21

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Hello,

syzbot found the following issue on:

HEAD commit: 9f67672a Merge tag 'ext4_for_linus' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=136256a5d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5427806e749e612b
dashboard link: https://syzkaller.appspot.com/bug?extid=4c4ffd1e1094dae61035
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17a4d5a3d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4c4ffd...@syzkaller.appspotmail.com

2021/05/01 15:27:37 executed programs: 23
BUG: memory leak
unreferenced object 0xffff8881131d9100 (size 232):
comm "kworker/u5:7", pid 8471, jiffies 4294965136 (age 11.710s)
hex dump (first 32 bytes):
d0 94 18 27 81 88 ff ff d0 94 18 27 81 88 ff ff ...'.......'....
00 00 00 00 00 00 00 00 00 94 18 27 81 88 ff ff ...........'....
backtrace:
[<ffffffff83678b3f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:413
[<ffffffff83c9cedd>] alloc_skb include/linux/skbuff.h:1107 [inline]
[<ffffffff83c9cedd>] mgmt_cmd_complete+0x3d/0x1a0 net/bluetooth/mgmt_util.c:146
[<ffffffff83c5d46e>] send_settings_rsp net/bluetooth/mgmt.c:1126 [inline]
[<ffffffff83c5d46e>] settings_rsp+0x5e/0x170 net/bluetooth/mgmt.c:1279
[<ffffffff83c9d1c6>] mgmt_pending_foreach+0x76/0xa0 net/bluetooth/mgmt_util.c:226
[<ffffffff83c68c3c>] __mgmt_power_off+0x5c/0x1e0 net/bluetooth/mgmt.c:8575
[<ffffffff83c392e9>] hci_dev_do_close+0x579/0x720 net/bluetooth/hci_core.c:1776
[<ffffffff8125d109>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
[<ffffffff8125d9f9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421
[<ffffffff81265268>] kthread+0x178/0x1b0 kernel/kthread.c:313
[<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

BUG: memory leak
unreferenced object 0xffff888126cdce00 (size 512):
comm "kworker/u5:7", pid 8471, jiffies 4294965136 (age 11.710s)
hex dump (first 32 bytes):
01 00 00 00 07 00 05 00 00 82 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff83678a0f>] kmalloc_reserve net/core/skbuff.c:354 [inline]
[<ffffffff83678a0f>] __alloc_skb+0xdf/0x280 net/core/skbuff.c:425
[<ffffffff83c9cedd>] alloc_skb include/linux/skbuff.h:1107 [inline]
[<ffffffff83c9cedd>] mgmt_cmd_complete+0x3d/0x1a0 net/bluetooth/mgmt_util.c:146
[<ffffffff83c5d46e>] send_settings_rsp net/bluetooth/mgmt.c:1126 [inline]
[<ffffffff83c5d46e>] settings_rsp+0x5e/0x170 net/bluetooth/mgmt.c:1279
[<ffffffff83c9d1c6>] mgmt_pending_foreach+0x76/0xa0 net/bluetooth/mgmt_util.c:226
[<ffffffff83c68c3c>] __mgmt_power_off+0x5c/0x1e0 net/bluetooth/mgmt.c:8575
[<ffffffff83c392e9>] hci_dev_do_close+0x579/0x720 net/bluetooth/hci_core.c:1776
[<ffffffff8125d109>] process_one_work+0x2c9/0x600 kernel/workqueue.c:2275
[<ffffffff8125d9f9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2421
[<ffffffff81265268>] kthread+0x178/0x1b0 kernel/kthread.c:313
[<ffffffff8100227f>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

---
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syzbot

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Aug 24, 2021, 8:31:23 PM8/24/21

syzbot has found a reproducer for the following issue on:

HEAD commit: 6e764bcd1cf7 Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=174af485300000
kernel config: https://syzkaller.appspot.com/x/.config?x=a938918bd15e088e
dashboard link: https://syzkaller.appspot.com/bug?extid=4c4ffd1e1094dae61035
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1355278d300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=150997c5300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4c4ffd...@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88811858bb00 (size 232):
comm "kworker/u5:10", pid 8505, jiffies 4294950224 (age 25.730s)

hex dump (first 32 bytes):

d0 14 3d 18 81 88 ff ff d0 14 3d 18 81 88 ff ff ..=.......=.....
00 00 00 00 00 00 00 00 00 14 3d 18 81 88 ff ff ..........=.....
backtrace:
[<ffffffff836e557f>] __alloc_skb+0x20f/0x280 net/core/skbuff.c:414
[<ffffffff83d1c5ed>] alloc_skb include/linux/skbuff.h:1112 [inline]
[<ffffffff83d1c5ed>] mgmt_cmd_complete+0x3d/0x1a0 net/bluetooth/mgmt_util.c:146
[<ffffffff83cdc8ee>] send_settings_rsp net/bluetooth/mgmt.c:1129 [inline]
[<ffffffff83cdc8ee>] settings_rsp+0x5e/0x170 net/bluetooth/mgmt.c:1282
[<ffffffff83d1c8d6>] mgmt_pending_foreach+0x76/0xa0 net/bluetooth/mgmt_util.c:226
[<ffffffff83ce80bc>] __mgmt_power_off+0x5c/0x1e0 net/bluetooth/mgmt.c:8583
[<ffffffff83cb8786>] hci_dev_do_close+0x5b6/0x710 net/bluetooth/hci_core.c:1774
[<ffffffff812636d9>] process_one_work+0x2c9/0x610 kernel/workqueue.c:2276
[<ffffffff81263fc9>] worker_thread+0x59/0x5d0 kernel/workqueue.c:2422
[<ffffffff8126d428>] kthread+0x188/0x1d0 kernel/kthread.c:319
[<ffffffff810022cf>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888111f7c600 (size 512):
comm "kworker/u5:10", pid 8505, jiffies 4294950224 (age 25.730s)

hex dump (first 32 bytes):

01 00 03 00 07 00 05 00 00 82 00 00 00 00 00 00 ................