linux-kernel - [PATCH 4/9] debugfs: Silence DEBUG_STRICT_USER_COPY

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Message-Id: <1305244212-19183-5-git-send-email-sboyd@codeaurora.org>
Date:	Thu, 12 May 2011 16:50:07 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 4/9] debugfs: 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 fs/debugfs/file.c:18:
In function 'copy_from_user',
    inlined from 'write_file_bool' at fs/debugfs/file.c:435:
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>
---
 fs/debugfs/file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 89d394d..7ead5b8 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -428,7 +428,7 @@ static ssize_t write_file_bool(struct file *file, const char __user *user_buf,
 			       size_t count, loff_t *ppos)
 {
 	char buf[32];
-	int buf_size;
+	size_t buf_size;
 	u32 *val = file->private_data;
 
 	buf_size = min(count, (sizeof(buf)-1));
-- 
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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