[PATCH] net: lwip: fix get_udev_ipv4_info()

[Jerome Forissier]

The local variables ipstr, maskstr and gwstr in static function
get_udev_ipv4_info() 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 at linaro.org>
Reported-by: Adriano Cordova <adrianox at gmail.com>
Link: https://lists.denx.de/pipermail/u-boot/2024-November/572066.html
Signed-off-by: Jerome Forissier <jerome.forissier at linaro.org>
---
 net/lwip/net-lwip.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/lwip/net-lwip.c b/net/lwip/net-lwip.c
index 470217781a4..b863047f598 100644
--- a/net/lwip/net-lwip.c
+++ b/net/lwip/net-lwip.c
@@ -91,9 +91,9 @@ struct netif *net_lwip_get_netif(void)
 static int get_udev_ipv4_info(struct udevice *dev, ip4_addr_t *ip,
 			      ip4_addr_t *mask, ip4_addr_t *gw)
 {
-	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";
 	int idx = dev_seq(dev);
 	char *env;
 
-- 
2.40.1