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

[ Upstream commit f3cc008bf6 ]

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>
5.4-rM2-2.2.x-imx-squashed
Dominik Czarnota 2020-03-09 16:22:50 +01:00 committed by Greg Kroah-Hartman
parent 753ea21f2a
commit 24e72d55bc
1 changed files with 1 additions and 1 deletions
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drivers/net/ethernet/samsung/sxgbe/sxgbe_main.c
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@ -2279,7 +2279,7 @@ 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;
}