linux-kernel - [PATCH 1/4] [SCSI] lpfc: Silence DEBUG_STRICT_USER_COPY

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Date:	Tue, 31 May 2011 11:14:30 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	"James E.J. Bottomley" <James.Bottomley@...e.de>
Subject: [PATCH 1/4] [SCSI] lpfc: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning

Enabling DEBUG_STRICT_USER_COPY_CHECKS causes the following
warning:

In file included from arch/x86/include/asm/uaccess.h:573,
                 from include/linux/uaccess.h:5,
                 from include/linux/highmem.h:7,
                 from include/linux/pagemap.h:10,
                 from include/linux/blkdev.h:12,
                 from drivers/scsi/lpfc/lpfc_debugfs.c:21:
In function 'copy_from_user':
arch/x86/include/asm/uaccess_64.h:65:
warning: call to 'copy_from_user_overflow' declared with
attribute warning: copy_from_user() buffer size is not provably
correct

presumably due to buf_size being signed causing GCC to fail to
see that buf_size can't become negative.

Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Acked-by: James Smart <james.smart@...lex.com>
---
 drivers/scsi/lpfc/lpfc_debugfs.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index ffe82d1..30b25c5 100644
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -1147,7 +1147,8 @@ static int lpfc_idiag_cmd_get(const char __user *buf, size_t nbytes,
 {
 	char mybuf[64];
 	char *pbuf, *step_str;
-	int bsize, i;
+	int i;
+	size_t bsize;
 
 	/* Protect copy from user */
 	if (!access_ok(VERIFY_READ, buf, nbytes))
-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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