[PATCH] remoteproc: imx_rproc: Adjust phandle parsing issue while remapping optional addresses in imx_rproc_addr_init()

[Aleksandr Mishin]

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.

Fixes: a0ff4aa6f010 ("remoteproc: imx_rproc: add a NXP/Freescale imx_rproc 
driver")
Signed-off-by: Aleksandr Mishin <amis...@t-argos.ru>
---
 drivers/remoteproc/imx_rproc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 5a3fb902acc9..39eacd90af14 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -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);
-- 
2.30.2