From: Jerome Forissier <jerome.forissier@linaro.org>
Date: Fri, 22 Nov 2024 12:35:29 +0000 (+0100)
Subject: net: lwip: fix dhcp_loop()
X-Git-Url: http://git.dujemihanovic.xyz/img/%7B%7B%20%24image.RelPermalink%20%7D%7D?a=commitdiff_plain;h=8c95d84b39fc0886a4417c5ddefc2ea05217c0ac;p=u-boot.git

net: lwip: fix dhcp_loop()

The local variables ipstr, maskstr and gwstr in static function
dhcp_loop() cannot be pointers to read-only data, since they may be
written to in case the device index is > 0. Therefore make them char
arrays allocated on the stack.

Reported-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
---

diff --git a/net/lwip/dhcp.c b/net/lwip/dhcp.c
index 23b5622692..bfc72ca6c5 100644
--- a/net/lwip/dhcp.c
+++ b/net/lwip/dhcp.c
@@ -27,9 +27,9 @@ static void call_lwip_dhcp_fine_tmr(void *ctx)
 
 static int dhcp_loop(struct udevice *udev)
 {
-	char *ipstr = "ipaddr\0\0";
-	char *maskstr = "netmask\0\0";
-	char *gwstr = "gatewayip\0\0";
+	char ipstr[] = "ipaddr\0\0";
+	char maskstr[] = "netmask\0\0";
+	char gwstr[] = "gatewayip\0\0";
 	unsigned long start;
 	struct netif *netif;
 	struct dhcp *dhcp;