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SubjectRe: [syzbot] memory leak in usb_get_configuration
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Hello,

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

BUG: memory leak
unreferenced object 0xffff8881128c0320 (size 32):
comm "kworker/1:1", pid 25, jiffies 4294943657 (age 15.110s)
hex dump (first 32 bytes):
09 02 12 00 01 00 00 00 00 09 04 00 00 00 d0 bb ................
3a 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 :...............
backtrace:
[<ffffffff82c98127>] kmalloc include/linux/slab.h:586 [inline]
[<ffffffff82c98127>] usb_get_configuration+0x1c7/0x1cd0 drivers/usb/core/config.c:919
[<ffffffff82c863f9>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline]
[<ffffffff82c863f9>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2536
[<ffffffff82c88ea4>] hub_port_connect drivers/usb/core/hub.c:5358 [inline]
[<ffffffff82c88ea4>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
[<ffffffff82c88ea4>] port_event drivers/usb/core/hub.c:5660 [inline]
[<ffffffff82c88ea4>] hub_event+0x1364/0x21a0 drivers/usb/core/hub.c:5742
[<ffffffff8126a41f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
[<ffffffff8126ad49>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
[<ffffffff81274705>] kthread+0x125/0x160 kernel/kthread.c:377
[<ffffffff810021ef>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888108eeb640 (size 64):
comm "kworker/1:1", pid 25, jiffies 4294943661 (age 15.080s)
hex dump (first 32 bytes):
01 00 00 00 01 00 00 00 09 04 00 00 00 d0 bb 3a ...............:
00 00 00 00 00 00 00 00 32 03 8c 12 81 88 ff ff ........2.......
backtrace:
[<ffffffff82c9871d>] kmalloc include/linux/slab.h:586 [inline]
[<ffffffff82c9871d>] kzalloc include/linux/slab.h:714 [inline]
[<ffffffff82c9871d>] usb_parse_configuration drivers/usb/core/config.c:772 [inline]
[<ffffffff82c9871d>] usb_get_configuration+0x7bd/0x1cd0 drivers/usb/core/config.c:944
[<ffffffff82c863f9>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline]
[<ffffffff82c863f9>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2536
[<ffffffff82c88ea4>] hub_port_connect drivers/usb/core/hub.c:5358 [inline]
[<ffffffff82c88ea4>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
[<ffffffff82c88ea4>] port_event drivers/usb/core/hub.c:5660 [inline]
[<ffffffff82c88ea4>] hub_event+0x1364/0x21a0 drivers/usb/core/hub.c:5742
[<ffffffff8126a41f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
[<ffffffff8126ad49>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
[<ffffffff81274705>] kthread+0x125/0x160 kernel/kthread.c:377
[<ffffffff810021ef>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

BUG: memory leak
unreferenced object 0xffff888112a7bf00 (size 64):
comm "kworker/1:2", pid 1569, jiffies 4294944314 (age 8.550s)
hex dump (first 32 bytes):
01 00 00 00 01 00 00 00 09 04 00 00 00 d0 bb 3a ...............:
00 00 00 00 00 00 00 00 52 66 72 12 81 88 ff ff ........Rfr.....
backtrace:
[<ffffffff82c9871d>] kmalloc include/linux/slab.h:586 [inline]
[<ffffffff82c9871d>] kzalloc include/linux/slab.h:714 [inline]
[<ffffffff82c9871d>] usb_parse_configuration drivers/usb/core/config.c:772 [inline]
[<ffffffff82c9871d>] usb_get_configuration+0x7bd/0x1cd0 drivers/usb/core/config.c:944
[<ffffffff82c863f9>] usb_enumerate_device drivers/usb/core/hub.c:2398 [inline]
[<ffffffff82c863f9>] usb_new_device+0x1a9/0x2e0 drivers/usb/core/hub.c:2536
[<ffffffff82c88ea4>] hub_port_connect drivers/usb/core/hub.c:5358 [inline]
[<ffffffff82c88ea4>] hub_port_connect_change drivers/usb/core/hub.c:5502 [inline]
[<ffffffff82c88ea4>] port_event drivers/usb/core/hub.c:5660 [inline]
[<ffffffff82c88ea4>] hub_event+0x1364/0x21a0 drivers/usb/core/hub.c:5742
[<ffffffff8126a41f>] process_one_work+0x2bf/0x600 kernel/workqueue.c:2307
[<ffffffff8126ad49>] worker_thread+0x59/0x5b0 kernel/workqueue.c:2454
[<ffffffff81274705>] kthread+0x125/0x160 kernel/kthread.c:377
[<ffffffff810021ef>] ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295



Tested on:

commit: 0014404f Merge branch 'akpm' (patches from Andrew)
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/
console output: https://syzkaller.appspot.com/x/log.txt?x=155954d9700000
kernel config: https://syzkaller.appspot.com/x/.config?x=3f0a704147ec8e32
dashboard link: https://syzkaller.appspot.com/bug?extid=f0fae482604e6d9a87c9
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=1005e709700000

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