From: Xiaobo Liu <cppcoffee@xxxxxxxxx>
[ 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>
---
net/atm/mpoa_proc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
index 46d6cd9a36ae..c4e9538ac144 100644
--- a/net/atm/mpoa_proc.c
+++ b/net/atm/mpoa_proc.c
@@ -222,11 +222,12 @@ 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;
}
--
2.35.1
