USB: fix usbmon BUG trigger
commit 46eb14a6 upstream. Automated tests triggered this by opening usbmon and accessing the mmap while simultaneously resizing the buffers. This bug was with us since 2006, because typically applications only size the buffers once and thus avoid racing. Reported by Kirill A. Shutemov. Reported-by: <syzbot+f9831b881b3e849829fc@syzkaller.appspotmail.com> Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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