From 7fff5e5955591ada15f4633a31932dc9d6c8086d Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Thu, 13 Apr 2023 02:06:22 -0400
Subject: ustar: Verify magic

---
(limited to 'src/ustar.c')

diff --git a/src/ustar.c b/src/ustar.c
index 6388d76..63998ec 100644
--- a/src/ustar.c
+++ b/src/ustar.c
@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "defs.h"
 #include "gzip.h"
 #include "ustar.h"
@@ -62,6 +63,10 @@ _opkg_opk_ustar_next(struct opkg_opk_gzip_state *gzip_state, const char *member,
 		case OPKG_OPK_ERROR:
 			return OPKG_OPK_ERROR;
 	}
+	if (strncmp(header->magic, "ustar", strlen("ustar")) != 0) {
+		return OPKG_OPK_ERROR;
+	}
+
 	size = strtol(header->size, &size_end, 10);
 	if (*size_end != '\0') {
 		return OPKG_OPK_ERROR;
--
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