linux-kernel - [PATCH 06/20] staging/lustre: fix comparison between signed and unsigned

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Date:	Sun,  1 Feb 2015 21:52:05 -0500
From:	green@...uxhacker.ru
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dmitry Eremin <dmitry.eremin@...el.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Subject: [PATCH 06/20] staging/lustre: fix comparison between signed and unsigned

From: Dmitry Eremin <dmitry.eremin@...el.com>

Expression if (size != (ssize_t)size) is always false.
Therefore no bounds check errors detected.

Signed-off-by: Dmitry Eremin <dmitry.eremin@...el.com>
Reviewed-on: http://review.whamcloud.com/11376
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5417
Reviewed-by: John L. Hammond <john.hammond@...el.com>
Reviewed-by: Fan Yong <fan.yong@...el.com>
Signed-off-by: Oleg Drokin <oleg.drokin@...el.com>
---
 drivers/staging/lustre/lustre/include/lustre/lustre_user.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/lustre/lustre/include/lustre/lustre_user.h b/drivers/staging/lustre/lustre/include/lustre/lustre_user.h
index 89794fd..176bd46 100644
--- a/drivers/staging/lustre/lustre/include/lustre/lustre_user.h
+++ b/drivers/staging/lustre/lustre/include/lustre/lustre_user.h
@@ -1012,7 +1012,7 @@ static inline ssize_t hur_len(struct hsm_user_request *hur)
 		(__u64)hur->hur_request.hr_itemcount *
 		sizeof(hur->hur_user_item[0]) + hur->hur_request.hr_data_len;
 
-	if (size != (ssize_t)size)
+	if (size > ~((size_t)0)>>1)
 		return -1;
 
 	return size;
-- 
2.1.0

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