net/atm: fix proc_mpc_write incorrect return value

Then the input contains '\0' or '\n', proc_mpc_write has read them, so the return value needs +1. Fixes: 1da177e ("Linux-2.6.12-rc2") Signed-off-by: Xiaobo Liu <[email protected]> Signed-off-by: David S. Miller <[email protected]>
josf · Oct 15, 2022 · d8bde3b · d8bde3b
1 parent a8aed7b
commit d8bde3b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
@@ -219,11 +219,12 @@ static ssize_t proc_mpc_write(struct file *file, const char __user *buff,
 	if (!page)
 		return -ENOMEM;
 
-	for (p = page, len = 0; len < nbytes; p++, len++) {
+	for (p = page, len = 0; len < nbytes; p++) {
 		if (get_user(*p, buff++)) {
 			free_page((unsigned long)page);
 			return -EFAULT;
 		}
+		len += 1;
 		if (*p == '\0' || *p == '\n')
 			break;
 	}