net: Enhancements for dhcp option 209
- Enable option 209 by default
- Set pxelinux_configfile to NULL to avoid potential double free
- change hardcoded 209 to a define
Signed-off-by: Sean Edmond <seanedmond@microsoft.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index c182d73..54c4ab8 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1898,6 +1898,7 @@
config BOOTP_PXE_DHCP_OPTION
bool "Request & store 'pxe_configfile' from BOOTP/DHCP server"
+ default y
depends on BOOTP_PXE
config BOOTP_VCI_STRING
diff --git a/cmd/pxe.c b/cmd/pxe.c
index 21134eb..9404f44 100644
--- a/cmd/pxe.c
+++ b/cmd/pxe.c
@@ -65,6 +65,8 @@
int ret = get_pxe_file(ctx, pxelinux_configfile, pxefile_addr_r);
free(pxelinux_configfile);
+ /* set to NULL to avoid double-free if DHCP is tried again */
+ pxelinux_configfile = NULL;
return ret;
}