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usb: avoid redundant allocation and free of memory

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If usb is not attached, it's unnessary to allocate, copy
and free memory

Signed-off-by: Weitao Hou <houweitaoo@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Weitao Hou 2019-05-23 19:52:08 +08:00 committed by Greg Kroah-Hartman
parent 6e9aed4ed4
commit 086ebf92aa
1 changed files with 3 additions and 5 deletions
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8
drivers/usb/core/devio.c
View file

@ -2130,6 +2130,9 @@ static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
if (ps->privileges_dropped)
return -EACCES;
if (!connected(ps))
return -ENODEV;
/* alloc buffer */
size = _IOC_SIZE(ctl->ioctl_code);
if (size > 0) {
@ -2146,11 +2149,6 @@ static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
}
}
if (!connected(ps)) {
kfree(buf);
return -ENODEV;
}
if (ps->dev->state != USB_STATE_CONFIGURED)
retval = -EHOSTUNREACH;
else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))