linux-kernel - [PATCH 3.16 101/328] pinctrl: berlin: fix 'pctrl->functions' allocation in berlin_pinctrl_build

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Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Jisheng Zhang" <Jisheng.Zhang@...aptics.com>,
        "YueHaibing" <yuehaibing@...wei.com>
Subject: [PATCH 3.16 101/328] pinctrl: berlin: fix 'pctrl->functions'
 allocation in berlin_pinctrl_build_state

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: YueHaibing <yuehaibing@...wei.com>

commit b5031b7db77dc47f474f0efc2b2552c32b7bb59d upstream.

fixes following Smatch static check warning:

 drivers/pinctrl/berlin/berlin.c:237 berlin_pinctrl_build_state()
 warn: passing devm_ allocated variable to kfree. 'pctrl->functions'

As we will be calling krealloc() on pointer 'pctrl->functions', which means
kfree() will be called in there, devm_kzalloc() shouldn't be used with
the allocation in the first place.  Fix the warning by calling kcalloc()
and managing the free procedure in error path on our own.

Fixes: 3de68d331c24 ("pinctrl: berlin: add the core pinctrl driver for Marvell Berlin SoCs")
Signed-off-by: YueHaibing <yuehaibing@...wei.com>
Reviewed-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[bwh: Backported to 3.16: berlin_pinctrl_state() was not yet converted
 to devm_kcalloc()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/pinctrl/berlin/berlin.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

--- a/drivers/pinctrl/berlin/berlin.c
+++ b/drivers/pinctrl/berlin/berlin.c
@@ -237,9 +237,8 @@ static int berlin_pinctrl_build_state(st
 	}
 
 	/* we will reallocate later */
-	pctrl->functions = devm_kzalloc(&pdev->dev,
-					max_functions * sizeof(*pctrl->functions),
-					GFP_KERNEL);
+	pctrl->functions = kcalloc(max_functions,
+				   sizeof(*pctrl->functions), GFP_KERNEL);
 	if (!pctrl->functions)
 		return -ENOMEM;
 
@@ -277,8 +276,10 @@ static int berlin_pinctrl_build_state(st
 				function++;
 			}
 
-			if (!found)
+			if (!found) {
+				kfree(pctrl->functions);
 				return -EINVAL;
+			}
 
 			if (!function->groups) {
 				function->groups =
@@ -286,8 +287,10 @@ static int berlin_pinctrl_build_state(st
 						     function->ngroups * sizeof(char *),
 						     GFP_KERNEL);
 
-				if (!function->groups)
+				if (!function->groups) {
+					kfree(pctrl->functions);
 					return -ENOMEM;
+				}
 			}
 
 			groups = function->groups;