linux-kernel - [PATCH 4.20 082/111] drm/vkms: Fix plane duplicate

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Date:   Mon, 21 Jan 2019 14:43:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+eb6e5365f23c02517dda@...kaller.appspotmail.com,
        Daniel Vetter <daniel.vetter@...el.com>,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 4.20 082/111] drm/vkms: Fix plane duplicate_state

4.20-stable review patch.  If anyone has any objections, please let me know.

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

From: Daniel Vetter <daniel.vetter@...ll.ch>

commit 7cdf33ab02e01300e7e6289acbac9cd8759f8712 upstream.

We need to handle allocation failures and bail out. While at it, tune
the allocation failures down to debug level.

syzbot injected an allocation failure and then hit this WARN_ON.

Reported-by: syzbot+eb6e5365f23c02517dda@...kaller.appspotmail.com
Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
Cc: Haneen Mohammed <hamohammed.sa@...il.com>
Cc: Sean Paul <seanpaul@...omium.org>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>
Cc: Gustavo Padovan <gustavo.padovan@...labora.com>
Reviewed-by: Eric Anholt <eric@...olt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20181128101033.4840-1-daniel.vetter@ffwll.ch
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/vkms/vkms_plane.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -23,8 +23,11 @@ vkms_plane_duplicate_state(struct drm_pl
 		return NULL;
 
 	crc_data = kzalloc(sizeof(*crc_data), GFP_KERNEL);
-	if (WARN_ON(!crc_data))
-		DRM_INFO("Couldn't allocate crc_data");
+	if (!crc_data) {
+		DRM_DEBUG_KMS("Couldn't allocate crc_data\n");
+		kfree(vkms_state);
+		return NULL;
+	}
 
 	vkms_state->crc_data = crc_data;