linux-kernel - Applied "regmap: debugfs: Ensure we don't underflow when printing access masks" to the regmap tree

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Message-Id: <E1ZdSFh-00045w-9C@finisterre>
Date:	Sat, 19 Sep 2015 17:13:09 -0700
From:	Mark Brown <broonie@...nel.org>
To:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Mark Brown <broonie@...nel.org>, stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regmap: debugfs: Ensure we don't underflow when printing access masks" to the regmap tree

The patch

   regmap: debugfs: Ensure we don't underflow when printing access masks

has been applied to the regmap tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From b763ec17ac762470eec5be8ebcc43e4f8b2c2b82 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@...nel.org>
Date: Sat, 19 Sep 2015 07:00:18 -0700
Subject: [PATCH] regmap: debugfs: Ensure we don't underflow when printing
 access masks

If a read is attempted which is smaller than the line length then we may
underflow the subtraction we're doing with the unsigned size_t type so
move some of the calculation to be additions on the right hand side
instead in order to avoid this.

Reported-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/base/regmap/regmap-debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index f42f2ba..1f32789 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -432,7 +432,7 @@ static ssize_t regmap_access_read_file(struct file *file,
 		/* If we're in the region the user is trying to read */
 		if (p >= *ppos) {
 			/* ...but not beyond it */
-			if (buf_pos >= count - 1 - tot_len)
+			if (buf_pos + tot_len + 1 >= count)
 				break;

 			/* Format the register */
-- 
2.5.0

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