FAILED: patch "[PATCH] drm/msm/dsi: fix memory corruption with too many bridges" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Possible dependencies:

2e786eb2f9ce ("drm/msm/dsi: fix memory corruption with too many bridges") 52749d601a60 ("drm/msm/dsi: Fix potential NULL pointer dereference in msm_dsi_modeset_init")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 2e786eb2f9cebb07e317226b60054df510b60c65 Mon Sep 17 00:00:00 2001
From: Johan Hovold <[email protected]>
Date: Tue, 13 Sep 2022 10:53:13 +0200
Subject: [PATCH] drm/msm/dsi: fix memory corruption with too many bridges

Add the missing sanity check on the bridge counter to avoid corrupting data beyond the fixed-sized bridge array in case there are ever more than eight bridges.

Patchwork: https://patchwork.freedesktop.org/patch/502668/

index 39bbabb5daf6..8a95c744972a 100644
@@ -218,6 +218,12 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		return -EINVAL;
 
 	priv = dev->dev_private;
+
+	if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
+		DRM_DEV_ERROR(dev->dev, "too many bridges\n");
+		return -ENOSPC;
+	}
+
 	msm_dsi->dev = dev;
 
 	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);