FAILED: patch "[PATCH] remoteproc: imx_rproc: Skip over memory region when node" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-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]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x 2fa26ca8b786888673689ccc9da6094150939982
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2024073036-capable-slander-fe44@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

2fa26ca8b786 ("remoteproc: imx_rproc: Skip over memory region when node value is NULL") afe670e23af9 ("remoteproc: imx_rproc: Fix ignoring mapping vdev regions") 8f2d8961640f ("remoteproc: imx_rproc: ignore mapping vdev regions")

thanks,

greg k-h

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

From 2fa26ca8b786888673689ccc9da6094150939982 Mon Sep 17 00:00:00 2001
From: Aleksandr Mishin <[email protected]>
Date: Thu, 6 Jun 2024 10:52:04 +0300
Subject: [PATCH] remoteproc: imx_rproc: Skip over memory region when node
value is NULL

In imx_rproc_addr_init() "nph = of_count_phandle_with_args()" just counts number of phandles. But phandles may be empty. So of_parse_phandle() in the parsing loop (0 < a < nph) may return NULL which is later dereferenced. Adjust this issue by adding NULL-return check.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

index 5a3fb902acc9..39eacd90af14 100644
@@ -726,6 +726,8 @@ static int imx_rproc_addr_init(struct imx_rproc *priv,
 		struct resource res;
 
 		node = of_parse_phandle(np, "memory-region", a);
+		if (!node)
+			continue;
 		/* Not map vdevbuffer, vdevring region */
 		if (!strncmp(node->name, "vdev", strlen("vdev"))) {
 			of_node_put(node);