linux-kernel - [PATCH] drm: qxl: ensure surf.data is ininitialized

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Message-Id: <20210608161313.161922-1-colin.king@canonical.com>
Date:   Tue,  8 Jun 2021 17:13:13 +0100
From:   Colin King <colin.king@...onical.com>
To:     Dave Airlie <airlied@...hat.com>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>, Alon Levy <alevy@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        spice-devel@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm: qxl: ensure surf.data is ininitialized

From: Colin Ian King <colin.king@...onical.com>

The object surf is not fully initialized and the uninitialized
field surf.data is being copied by the call to qxl_bo_create
via the call to qxl_gem_object_create. Set surf.data to zero
to ensure garbage data from the stack is not being copied.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: f64122c1f6ad ("drm: add new QXL driver. (v1.4)")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/qxl/qxl_dumb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/qxl/qxl_dumb.c b/drivers/gpu/drm/qxl/qxl_dumb.c
index a635d9fdf8ac..d636ba685451 100644
--- a/drivers/gpu/drm/qxl/qxl_dumb.c
+++ b/drivers/gpu/drm/qxl/qxl_dumb.c
@@ -58,6 +58,8 @@ int qxl_mode_dumb_create(struct drm_file *file_priv,
 	surf.height = args->height;
 	surf.stride = pitch;
 	surf.format = format;
+	surf.data = 0;
+
 	r = qxl_gem_object_create_with_handle(qdev, file_priv,
 					      QXL_GEM_DOMAIN_CPU,
 					      args->size, &surf, &qobj,
-- 
2.31.1