[syzbot] memory leak in __build_skb (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    1b929c02afd3 Linux 6.2-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17b7126c480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4fb7ad9185f1501
dashboard link: https://syzkaller.appspot.com/bug?extid=e008dccab31bd3647609
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15ee522f880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16d6e73c480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/800650ebc0df/disk-1b929c02.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b1f1852b762a/vmlinux-1b929c02.xz
kernel image: https://storage.googleapis.com/syzbot-assets/15ebd3d96567/bzImage-1b929c02.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e008dccab31bd3647609@xxxxxxxxxxxxxxxxxxxxxxxxx

BUG: memory leak
unreferenced object 0xffff88810535b500 (size 240):
  comm "softirq", pid 0, jiffies 4294946605 (age 8.190s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff83b0df31>] __build_skb+0x21/0x60 net/core/skbuff.c:377
    [<ffffffff83b0e23e>] __netdev_alloc_skb+0x14e/0x220 net/core/skbuff.c:657
    [<ffffffff82e49530>] __dev_alloc_skb include/linux/skbuff.h:3165 [inline]
    [<ffffffff82e49530>] ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:635 [inline]
    [<ffffffff82e49530>] ath9k_hif_usb_rx_cb+0x1d0/0x660 drivers/net/wireless/ath/ath9k/hif_usb.c:686
    [<ffffffff8302c52c>] __usb_hcd_giveback_urb+0xfc/0x230 drivers/usb/core/hcd.c:1671
    [<ffffffff8302c80b>] usb_hcd_giveback_urb+0x1ab/0x1c0 drivers/usb/core/hcd.c:1754
    [<ffffffff831d5874>] dummy_timer+0x8e4/0x14c0 drivers/usb/gadget/udc/dummy_hcd.c:1988
    [<ffffffff8132a8b3>] call_timer_fn+0x33/0x1f0 kernel/time/timer.c:1700
    [<ffffffff8132ab6f>] expire_timers+0xff/0x1d0 kernel/time/timer.c:1751
    [<ffffffff8132ad69>] __run_timers kernel/time/timer.c:2022 [inline]
    [<ffffffff8132ad69>] __run_timers kernel/time/timer.c:1995 [inline]
    [<ffffffff8132ad69>] run_timer_softirq+0x129/0x2f0 kernel/time/timer.c:2035
    [<ffffffff84908afb>] __do_softirq+0xeb/0x2ef kernel/softirq.c:571



---
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@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches