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fail_function: switch to memdup_user_nul() helper

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

Link: https://lkml.kernel.org/r/20220826073337.2085798-1-yangyingliang@huawei.com
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yang Yingliang 2022-08-26 15:33:35 +08:00 committed by Andrew Morton
parent 9a15193e23
commit f81259c6db
1 changed files with 4 additions and 9 deletions
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13
kernel/fail_function.c
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@ -247,15 +247,11 @@ static ssize_t fei_write(struct file *file, const char __user *buffer,
/* cut off if it is too long */
if (count > KSYM_NAME_LEN)
count = KSYM_NAME_LEN;
buf = kmalloc(count + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, buffer, count)) {
ret = -EFAULT;
goto out_free;
}
buf[count] = '\0';
buf = memdup_user_nul(buffer, count);
if (IS_ERR(buf))
return PTR_ERR(buf);
sym = strstrip(buf);
mutex_lock(&fei_lock);
@ -308,7 +304,6 @@ static ssize_t fei_write(struct file *file, const char __user *buffer,
}
out:
mutex_unlock(&fei_lock);
out_free:
kfree(buf);
return ret;
}