Patch "net/atm: fix proc_mpc_write incorrect return value" has been added to the 4.14-stable tree

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This is a note to let you know that I've just added the patch titled

    net/atm: fix proc_mpc_write incorrect return value

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-atm-fix-proc_mpc_write-incorrect-return-value.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 250d42f30b0d00edfba8d006684860f3573661b2
Author: Xiaobo Liu <cppcoffee@xxxxxxxxx>
Date:   Fri Oct 14 10:05:40 2022 +0800

    net/atm: fix proc_mpc_write incorrect return value
    
    [ Upstream commit d8bde3bf7f82dac5fc68a62c2816793a12cafa2a ]
    
    Then the input contains '\0' or '\n', proc_mpc_write has read them,
    so the return value needs +1.
    
    Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
    Signed-off-by: Xiaobo Liu <cppcoffee@xxxxxxxxx>
    Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
index 8a0c17e1c203..4d5f8690e914 100644
--- a/net/atm/mpoa_proc.c
+++ b/net/atm/mpoa_proc.c
@@ -220,11 +220,12 @@ 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;
 	}



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