[PATCH] boot: pxe_utils: Allocate space for overlay_dir before writing into it

[Surkov Kirill]

The pxe_utils/label_boot_extension calls snprintf on an uninitialized memory overlay_dir.
This results in a crash when calling sysboot.

This commit fixes this issue.

Signed-off-by: Surkov Kirill <fanra3.tk at gmail.com>
---
 boot/pxe_utils.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/boot/pxe_utils.c b/boot/pxe_utils.c
index 038416203fc..fc72dbf6020 100644
--- a/boot/pxe_utils.c
+++ b/boot/pxe_utils.c
@@ -463,6 +463,8 @@ static void label_boot_extension(struct pxe_context *ctx,
 	if (fdt_check_header(working_fdt))
 		return;
 
+	overlay_dir = calloc(1, len);
+
 	/* Use fdtdir for now as the overlay devicetree directory */
 	if (label->fdtdir) {
 		len = strlen(label->fdtdir);
@@ -474,7 +476,6 @@ static void label_boot_extension(struct pxe_context *ctx,
 			slash = "";
 
 		dir_len = strlen(label->fdtdir) + strlen(slash) + 1;
-		overlay_dir = calloc(1, len);
 		if (!overlay_dir)
 			return;
 
-- 
2.43.0