[tip:x86/urgent] x86, build: Make sure mkpiggy fails on read error

[tip-bot for Daniel J Blueman <daniel.blueman@gmail.com>]

Commit-ID:  6670e9cdaf554290e26121aa72f0118f2fac52e5
Gitweb:     http://git.kernel.org/tip/6670e9cdaf554290e26121aa72f0118f2fac52e5
Author:     Daniel J Blueman <daniel.blueman@gmail.com>
AuthorDate: Wed, 23 Feb 2011 09:33:59 +0800
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 1 Mar 2011 16:32:03 -0800

x86, build: Make sure mkpiggy fails on read error

Ensure build doesn't silently continue despite read failure,
addressing a warning due to the unchecked call.

Signed-off-by: Daniel J Blueman <daniel.blueman@gmail.com>
LKML-Reference: <AANLkTimxxTMU3=4ry-_zbY6v1xiDi+hW9y1RegTr8vLK@mail.gmail.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 arch/x86/boot/compressed/mkpiggy.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/arch/x86/boot/compressed/mkpiggy.c b/arch/x86/boot/compressed/mkpiggy.c
index 646aa78..46a8238 100644
--- a/arch/x86/boot/compressed/mkpiggy.c
+++ b/arch/x86/boot/compressed/mkpiggy.c
@@ -62,7 +62,12 @@ int main(int argc, char *argv[])
 	if (fseek(f, -4L, SEEK_END)) {
 		perror(argv[1]);
 	}
-	fread(&olen, sizeof olen, 1, f);
+
+	if (fread(&olen, sizeof(olen), 1, f) != 1) {
+		perror(argv[1]);
+		return 1;
+	}
+
 	ilen = ftell(f);
 	olen = getle32(&olen);
 	fclose(f);