linux-kernel - [patch 1/2 -resend] dma-debug: debugfs_create

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Message-ID: <20120627090854.GS31212@elgon.mountain>
Date:	Wed, 27 Jun 2012 12:08:55 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Neil Horman <nhorman@...driver.com>,
	Jakub Kicinski <kubakici@...pl>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch 1/2 -resend] dma-debug: debugfs_create_bool() takes a u32
 pointer

Even though it has "bool" in the name, you have pass a u32 pointer to
debugfs_create_bool().  Otherwise you get memory corruption in
write_file_bool().  Fortunately in this case the corruption happens in
an alignment hole between variables so it doesn't cause any problems.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
This was sent on Fri, 2 Mar 2012.

It's probably my fault the bug is still there.  I submitted the patch
but the feed back was that debugfs_create_bool() has a stupid API and
should take a pointer to a bool.  I said that yes, probably that is true
but only two places use the current API incorrectly and I fixed the
other place as well.

I assumed that both my patches would be merged and the person who cared
about API would fix the API but neither of my fixes were applied.

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 518aea7..66ce414 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -78,7 +78,7 @@ static LIST_HEAD(free_entries);
 static DEFINE_SPINLOCK(free_entries_lock);

 /* Global disable flag - will be set in case of an error */
-static bool global_disable __read_mostly;
+static u32 global_disable __read_mostly;

 /* Global error count */
 static u32 error_count;
@@ -657,7 +657,7 @@ static int dma_debug_fs_init(void)

 	global_disable_dent = debugfs_create_bool("disabled", 0444,
 			dma_debug_dent,
-			(u32 *)&global_disable);
+			&global_disable);
 	if (!global_disable_dent)
 		goto out_err;

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