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powerpc/nvram: use memdup_user

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Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Geliang Tang 2017-04-29 09:45:13 +08:00 committed by Kees Cook
parent 077090af33
commit 0752e4028c
1 changed files with 5 additions and 9 deletions
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14
arch/powerpc/kernel/nvram_64.c
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@ -792,21 +792,17 @@ static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
count = min_t(size_t, count, size - *ppos);
count = min(count, PAGE_SIZE);
ret = -ENOMEM;
tmp = kmalloc(count, GFP_KERNEL);
if (!tmp)
goto out;
ret = -EFAULT;
if (copy_from_user(tmp, buf, count))
tmp = memdup_user(buf, count);
if (IS_ERR(tmp)) {
ret = PTR_ERR(tmp);
goto out;
}
ret = ppc_md.nvram_write(tmp, count, ppos);
out:
kfree(tmp);
out:
return ret;
}
static long dev_nvram_ioctl(struct file *file, unsigned int cmd,