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net/atm: fix proc_mpc_write incorrect return value

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[ 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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xiaobo Liu 2022-10-14 10:05:40 +08:00 committed by Greg Kroah-Hartman
parent 0b127ae537
commit 726e4d1694
1 changed files with 2 additions and 1 deletions
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3
net/atm/mpoa_proc.c
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@ -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;
}