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platform/x86: thinkpad_acpi: Switch to memdup_user_nul() helper

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

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230810122012.2110410-1-ruanjinjie@huawei.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Ruan Jinjie 2023-08-10 20:20:12 +08:00 committed by Hans de Goede
parent 65c6ea33e7
commit 4316c64085
1 changed files with 3 additions and 10 deletions
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13
drivers/platform/x86/thinkpad_acpi.c
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@ -913,16 +913,9 @@ static ssize_t dispatch_proc_write(struct file *file,
if (count > PAGE_SIZE - 1)
return -EINVAL;
kernbuf = kmalloc(count + 1, GFP_KERNEL);
if (!kernbuf)
return -ENOMEM;
if (copy_from_user(kernbuf, userbuf, count)) {
kfree(kernbuf);
return -EFAULT;
}
kernbuf[count] = 0;
kernbuf = memdup_user_nul(userbuf, count);
if (IS_ERR(kernbuf))
return PTR_ERR(kernbuf);
ret = ibm->write(kernbuf);
if (ret == 0)
ret = count;