[PATCH] drm/exynos: added validation of edid for vidi connection

[Seung-Woo Kim]

If edid of vidi from user is invalid, size calculated from a number
of cea extensions can be wrong. So, validation should be checked.

Signed-off-by: Seung-Woo Kim <sw0312.kim at samsung.com>
Signed-off-by: Kyungmin.park <kyungmin.park at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_vidi.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_vidi.c b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
index b192308..26d8261 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_vidi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_vidi.c
@@ -558,11 +558,11 @@ int vidi_connection_ioctl(struct drm_device *drm_dev, void *data,
 	}
 
 	if (vidi->connection) {
-		if (!vidi->edid) {
-			DRM_DEBUG_KMS("edid data is null.\n");
+		raw_edid = (struct edid *)(uint32_t)vidi->edid;
+		if (!drm_edid_is_valid(raw_edid)) {
+			DRM_DEBUG_KMS("edid data is invalid.\n");
 			return -EINVAL;
 		}
-		raw_edid = (struct edid *)(uint32_t)vidi->edid;
 		edid_len = (1 + raw_edid->extensions) * EDID_LENGTH;
 		ctx->raw_edid = kzalloc(edid_len, GFP_KERNEL);
 		if (!ctx->raw_edid) {
-- 
1.7.4.1