linux-kernel - [PATCH] video: fix invalid free of devm

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Message-Id: <1364428524-13821-1-git-send-email-epure.andrei@gmail.com>
Date:	Thu, 28 Mar 2013 01:55:24 +0200
From:	Andrei Epure <epure.andrei@...il.com>
To:	linux@...sktech.co.nz, FlorianSchandinat@....de,
	linux-arm-kernel@...ts.infradead.org
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrei Epure <epure.andrei@...il.com>
Subject: [PATCH] video: fix invalid free of devm_ allocated data

The objects allocated by devm_* APIs are managed by devres and are freed when
the device is detached. Hence there is no need to use kfree() explicitly.
Patch found using coccinelle.

Signed-off-by: Andrei Epure <epure.andrei@...il.com>
---
 drivers/video/vt8500lcdfb.c |    3 ---
 drivers/video/wm8505fb.c    |    3 ---
 2 files changed, 6 deletions(-)

diff --git a/drivers/video/vt8500lcdfb.c b/drivers/video/vt8500lcdfb.c
index b4ccca2..ea3ee61 100644
--- a/drivers/video/vt8500lcdfb.c
+++ b/drivers/video/vt8500lcdfb.c
@@ -465,7 +465,6 @@ failed_free_res:
 	release_mem_region(res->start, resource_size(res));
 failed_fbi:
 	platform_set_drvdata(pdev, NULL);
-	kfree(fbi);
 failed:
 	return ret;
 }
@@ -494,8 +493,6 @@ static int vt8500lcd_remove(struct platform_device *pdev)
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(res->start, resource_size(res));
 
-	kfree(fbi);
-
 	return 0;
 }
 
diff --git a/drivers/video/wm8505fb.c b/drivers/video/wm8505fb.c
index 2e8298e..34a2de1 100644
--- a/drivers/video/wm8505fb.c
+++ b/drivers/video/wm8505fb.c
@@ -427,7 +427,6 @@ failed_free_res:
 	release_mem_region(res->start, resource_size(res));
 failed_fbi:
 	platform_set_drvdata(pdev, NULL);
-	kfree(fbi);
 failed:
 	return ret;
 }
@@ -451,8 +450,6 @@ static int wm8505fb_remove(struct platform_device *pdev)
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(res->start, resource_size(res));
 
-	kfree(fbi);
-
 	return 0;
 }
 
-- 
1.7.9.5

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