sxgbe: Fix off by one in samsung driver strncpy size arg

[ Upstream commit f3cc008bf6d59b8d93b4190e01d3e557b0040e15 ]

This patch fixes an off-by-one error in strncpy size argument in
drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c. The issue is that in:

        strncmp(opt, "eee_timer:", 6)

the passed string literal: "eee_timer:" has 10 bytes (without the NULL
byte) and the passed size argument is 6. As a result, the logic will
also accept other, malformed strings, e.g. "eee_tiXXX:".

This bug doesn't seem to have any security impact since its present in
module's cmdline parsing code.

Signed-off-by: Dominik Czarnota <dominik.b.czarnota@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
index ea44a24..11dd7c8 100644 (file)
--- a/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
+++ b/drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
@@ -2313,7 +2313,7 @@ static int __init sxgbe_cmdline_opt(char *str)
        if (!str || !*str)
                return -EINVAL;
        while ((opt = strsep(&str, ",")) != NULL) {
-               if (!strncmp(opt, "eee_timer:", 6)) {
+               if (!strncmp(opt, "eee_timer:", 10)) {
                        if (kstrtoint(opt + 10, 0, &eee_timer))
                                goto err;
                }