[PATCH 4.19 122/196] remoteproc: imx_rproc: Skip over memory region when node value is NULL

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aleksandr Mishin <amishin@xxxxxxxxxx>

[ Upstream commit 2fa26ca8b786888673689ccc9da6094150939982 ]

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 <amishin@xxxxxxxxxx>
Reviewed-by: Peng Fan <peng.fan@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20240606075204.12354-1-amishin@xxxxxxxxxx
[Fixed title to fit within the prescribed 70-75 charcters]
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 4eec6b380f11c..7597f09a3455b 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -289,6 +289,8 @@ 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")))
 			continue;
-- 
2.43.0







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