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ALSA: asihpi: check return value of get_user()

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get_user() may fail, if so return -EFAULT.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Kulikov Vasiliy 2010-07-28 20:41:56 +04:00 committed by Takashi Iwai
parent b3390ceab9
commit ec9d04b2a8
1 changed files with 13 additions and 4 deletions
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17
sound/pci/asihpi/hpioctl.c
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@ -121,11 +121,17 @@ long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
phpi_ioctl_data = (struct hpi_ioctl_linux __user *)arg;
/* Read the message and response pointers from user space. */
get_user(puhm, &phpi_ioctl_data->phm);
get_user(puhr, &phpi_ioctl_data->phr);
if (get_user(puhm, &phpi_ioctl_data->phm) ||
get_user(puhr, &phpi_ioctl_data->phr)) {
err = -EFAULT;
goto out;
}
/* Now read the message size and data from user space. */
get_user(hm->h.size, (u16 __user *)puhm);
if (get_user(hm->h.size, (u16 __user *)puhm)) {
err = -EFAULT;
goto out;
}
if (hm->h.size > sizeof(*hm))
hm->h.size = sizeof(*hm);
@ -138,7 +144,10 @@ long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
goto out;
}
get_user(res_max_size, (u16 __user *)puhr);
if (get_user(res_max_size, (u16 __user *)puhr)) {
err = -EFAULT;
goto out;
}
/* printk(KERN_INFO "user response size %d\n", res_max_size); */
if (res_max_size < sizeof(struct hpi_response_header)) {
HPI_DEBUG_LOG(WARNING, "small res size %d\n", res_max_size);