From 843aa92266e3df22160d16a30aa4d731fccb9ec5 Mon Sep 17 00:00:00 2001
From: Eric Curtin <ecurtin@redhat.com>
Date: Mon, 8 May 2023 16:42:21 +0100
Subject: [PATCH] Change hdr_offset to signed value, so lseek64 return can be
 checked

The lines:

	if (instance == PRIMARY_GPT)
		hdr_offset = block_size;
	else {
		hdr_offset = lseek64(fd, 0, SEEK_END) - block_size;
	}
	if (hdr_offset < 0) {
		fprintf(stderr, "%s: Failed to get gpt header offset\n",
			__func__);
		goto error;
	}

are error checked. But previously hdr_offset could never be less than
zero because it was unsigned.
---
 gpt-utils.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gpt-utils.cpp b/gpt-utils.cpp
index b913d42..8405f1e 100644
--- a/gpt-utils.cpp
+++ b/gpt-utils.cpp
@@ -442,7 +442,7 @@ static uint8_t *gpt_get_header(const char *partname, enum gpt_instance instance)
 {
 	uint8_t *hdr = NULL;
 	char devpath[PATH_MAX] = { 0 };
-	uint64_t hdr_offset = 0;
+	off_t hdr_offset = 0;
 	uint32_t block_size = 0;
 	int fd = -1;
 	if (!partname) {