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

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Message-ID: <tip-6670e9cdaf554290e26121aa72f0118f2fac52e5@git.kernel.org>
Date:	Wed, 2 Mar 2011 00:43:04 GMT
From:	tip-bot for Daniel J Blueman <daniel.blueman@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	daniel.blueman@...il.com, tglx@...utronix.de, hpa@...ux.intel.com
Subject: [tip:x86/urgent] x86, build: Make sure mkpiggy fails on read error

Commit-ID:  6670e9cdaf554290e26121aa72f0118f2fac52e5
Gitweb:     http://git.kernel.org/tip/6670e9cdaf554290e26121aa72f0118f2fac52e5
Author:     Daniel J Blueman <daniel.blueman@...il.com>
AuthorDate: Wed, 23 Feb 2011 09:33:59 +0800
Committer:  H. Peter Anvin <hpa@...ux.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@...il.com>
LKML-Reference: <AANLkTimxxTMU3=4ry-_zbY6v1xiDi+hW9y1RegTr8vLK@...l.gmail.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.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);
--
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