linux-kernel - [PATCH] remoteproc: imx_rproc: Not report loaded resource table when none

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Message-Id: <20260122-imx-rproc-fix-v1-1-36cc64369a40@nxp.com>
Date: Thu, 22 Jan 2026 11:24:43 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: Bjorn Andersson <andersson@...nel.org>, 
 Mathieu Poirier <mathieu.poirier@...aro.org>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Iuliana Prodan <iuliana.prodan@....com>, 
 Daniel Baluta <daniel.baluta@....com>, Frank Li <frank.li@....com>
Cc: linux-remoteproc@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Peng Fan <peng.fan@....com>, stable@...r.kernel.org
Subject: [PATCH] remoteproc: imx_rproc: Not report loaded resource table
 when none

From: Peng Fan <peng.fan@....com>

When starting a firmware without a resource table after previously running
one that had a resource table, imx_rproc_elf_find_loaded_rsc_table() may
incorrectly return a valid device memory pointer (priv->rsc_table).

In this case rproc->cached_table is NULL because the current firmware does
not contain a resource table, but the remoteproc core still interprets the
non-NULL return value as a loaded resource table and attempts to memcpy()
from rproc->cached_table, leading to a NULL pointer dereference and kernel
panic.

Fix this by returning NULL from imx_rproc_elf_find_loaded_rsc_table() when
there is no cached resource table for the current firmware. This ensures
that a loaded resource table is only reported when a valid cached_table
exists, which matches the remoteproc core expectations.

This issue can be reproduced by:
  1) start a firmware with a resource table
  2) stop the remote processor
  3) start a firmware without a resource table

With this change, starting a firmware without a resource table no longer
causes kernel dump.

Fixes: e954a1bd1610 ("remoteproc: imx_rproc: Use imx specific hook for find_loaded_rsc_table")
Cc: stable@...r.kernel.org
Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/remoteproc/imx_rproc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 375de79168a1c8d11b87ac1bd63774a3feac106d..cf044b385b58fe1e17d0fc440c243d76ecf020ae 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -729,6 +729,10 @@ imx_rproc_elf_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *
 {
 	struct imx_rproc *priv = rproc->priv;

+	/* No resource table in the firmware */
+	if (!rproc->cached_table)
+		return NULL;
+
 	if (priv->rsc_table)
 		return (struct resource_table *)priv->rsc_table;

---
base-commit: e3b32dcb9f23e3c3927ef3eec6a5842a988fb574
change-id: 20260122-imx-rproc-fix-e206f8e6e477

Best regards,
-- 
Peng Fan <peng.fan@....com>