From cd490b6ff02d1cea5390760f457b73495661c73f Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Mon, 17 Apr 2023 17:33:53 -0400
Subject: ustar: Verify typeflag

---
(limited to 'src')

diff --git a/src/ustar.c b/src/ustar.c
index c183560..4cc4651 100644
--- a/src/ustar.c
+++ b/src/ustar.c
@@ -114,10 +114,26 @@ _opkg_opk_ustar_next(struct opkg_opk_ustar *ustar,
 		return OPKG_OPK_ERROR;
 	}
 
-	ustar->data_size_remaining = strtol((char *) header->size, &end,
-			OPKG_OPK_USTAR_NUM_BASE_);
-	if (*end != '\0') {
-		return OPKG_OPK_ERROR;
+	switch (*header->typeflag) {
+		case '0':  /* Regular file */
+		case '7':  /* High-performance or regular file */
+			ustar->data_size_remaining = strtol(
+					(char *) header->size, &end,
+					OPKG_OPK_USTAR_NUM_BASE_);
+			if (*end != '\0') {
+				return OPKG_OPK_ERROR;
+			}
+			break;
+		case '2':  /* Symbolic link */
+		case '3':  /* Character special file */
+		case '4':  /* Block special file */
+		case '5':  /* Directory */
+		case '6':  /* FIFO special file */
+			ustar->data_size_remaining = 0;
+			break;
+		case '1':  /* Link */
+		default:   /* Reserved */
+			return OPKG_OPK_ERROR;  /* Unsupported */
 	}
 
 	return OPKG_OPK_OK;
--
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