From: Mikulas Patocka <mpatocka@redhat.com>
Date: Sun, 3 Jun 2018 14:40:57 +0000 (+0200)
Subject: udl-kms: fix crash due to uninitialized memory
X-Git-Tag: v4.14.68~39
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c0357c1895aedbcbbd9a2eefbff9504f904161f7;p=platform%2Fkernel%2Flinux-rpi.git

udl-kms: fix crash due to uninitialized memory

commit 09a00abe3a9941c2715ca83eb88172cd2f54d8fd upstream.

We must use kzalloc when allocating the fb_deferred_io structure.
Otherwise, the field first_io is undefined and it causes a crash.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index d558319..c3f5867 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -221,7 +221,7 @@ 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;