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cdrom: don't open-code memdup_user() 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-01-02 14:59:38 -05:00
parent 820351f05b
commit abb0f6a79f
1 changed files with 3 additions and 7 deletions
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10
drivers/cdrom/cdrom.c
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@ -3186,15 +3186,11 @@ static noinline int mmc_ioctl_dvd_read_struct(struct cdrom_device_info *cdi,
if (!CDROM_CAN(CDC_DVD))
return -ENOSYS;
s = kmalloc(size, GFP_KERNEL);
if (!s)
return -ENOMEM;
s = memdup_user(arg, size);
if (IS_ERR(s))
return PTR_ERR(s);
cd_dbg(CD_DO_IOCTL, "entering DVD_READ_STRUCT\n");
if (copy_from_user(s, arg, size)) {
kfree(s);
return -EFAULT;
}
ret = dvd_read_struct(cdi, s, cgc);
if (ret)