[syslinux:master] isohybrid: fix overflow on 32 bit system

[syslinux-bot for Kai Kang]

Commit-ID:  bc360f8dbdf27bff07bb5db8d0ea9a7b10d8e3d1
Gitweb:     http://www.syslinux.org/commit/bc360f8dbdf27bff07bb5db8d0ea9a7b10d8e3d1
Author:     Kai Kang <kai.kang at windriver.com>
AuthorDate: Fri, 20 Jun 2014 11:32:11 +0800
Committer:  H. Peter Anvin <hpa at zytor.com>
CommitDate: Thu, 19 Jun 2014 20:50:57 -0700

isohybrid: fix overflow on 32 bit system

When call isohybrid with option '-u', it overflows on a 32 bits host. It
seeks to 512 bytes before the end of the image to install gpt header. If
the size of image is larger than LONG_MAX, it overflows fseek() and
cause error:

isohybrid: image-x86-64-20140505110100.iso: seek error - 8: Invalid argument

Replace fseek with fseeko to fix this issue.

Signed-off-by: Kai Kang <kai.kang at windriver.com>
Signed-off-by: H. Peter Anvin <hpa at zytor.com>

---
 utils/isohybrid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils/isohybrid.c b/utils/isohybrid.c
index 410bb60..23fc6c0 100644
--- a/utils/isohybrid.c
+++ b/utils/isohybrid.c
@@ -1126,7 +1126,7 @@ main(int argc, char *argv[])
 	 * end of the image
 	 */
 
-	if (fseek(fp, (isostat.st_size + padding) - orig_gpt_size - 512,
+	if (fseeko(fp, (isostat.st_size + padding) - orig_gpt_size - 512,
 		  SEEK_SET))
 	    err(1, "%s: seek error - 8", argv[0]);