linux-kernel - [PATCH] udl: zero out struct fb_deferred

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Message-Id: <1358544316-6024-1-git-send-email-nickolai@csail.mit.edu>
Date:	Fri, 18 Jan 2013 16:25:16 -0500
From:	Nickolai Zeldovich <nickolai@...il.mit.edu>
To:	David Airlie <airlied@...ux.ie>
Cc:	Nickolai Zeldovich <nickolai@...il.mit.edu>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] udl: zero out struct fb_deferred_io on allocation

Ensure all fields of the struct fb_deferred_io are zeroed out on init,
otherwise the fbdefio->first_io function pointer can contain garbage,
and fb_deferred_io_mkwrite() will end up jumping to this garbage address.

Signed-off-by: Nickolai Zeldovich <nickolai@...il.mit.edu>
---
 drivers/gpu/drm/udl/udl_fb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index d4ab3be..40503ba 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -301,7 +301,7 @@ static int udl_fb_open(struct fb_info *info, int user)
 
 		struct fb_deferred_io *fbdefio;
 
-		fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
+		fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
 
 		if (fbdefio) {
 			fbdefio->delay = DL_DEFIO_WRITE_DELAY;
-- 
1.7.10.4

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