[PATCH 44/44] debugfs: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning

Greg Kroah-Hartman
2011-05-20T00:12:32Z

From: Stephen Boyd <sboyd@codeaurora.org>

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@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
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 568304d..90f7657 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;
bool bv;
u32 *val = file->private_data;

--
1.7.4.2