[PATCH 6.19 735/844] remoteproc: imx_rproc: Fix invalid loaded resource table detection

[Sasha Levin]

From: Peng Fan <peng.fan@xxxxxxx>

[ Upstream commit 26aa5295010ffaebcf8f1991c53fa7cf2ee1b20d ]

imx_rproc_elf_find_loaded_rsc_table() may incorrectly report a loaded
resource table even when the current firmware does not provide one.

When the device tree contains a "rsc-table" entry, priv->rsc_table is
non-NULL and denotes where a resource table would be located if one is
present in memory. However, when the current firmware has no resource
table, rproc->table_ptr is NULL. The function still returns
priv->rsc_table, and the remoteproc core interprets this as a valid loaded
resource table.

Fix this by returning NULL from imx_rproc_elf_find_loaded_rsc_table() when
there is no resource table for the current firmware (i.e. when
rproc->table_ptr is NULL). This aligns the function's semantics with the
remoteproc core: a loaded resource table is only reported when a valid
table_ptr exists.

With this change, starting firmware without a resource table no longer
triggers a crash.

Fixes: e954a1bd1610 ("remoteproc: imx_rproc: Use imx specific hook for find_loaded_rsc_table")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
Acked-by: Daniel Baluta <daniel.baluta@xxxxxxx>
Link: https://lore.kernel.org/r/20260129-imx-rproc-fix-v3-1-fc4e41e6e750@xxxxxxx
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 33f21ab24c921..d93bf5134d6f0 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c
@@ -609,6 +609,10 @@ 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->table_ptr)
+		return NULL;
+
 	if (priv->rsc_table)
 		return (struct resource_table *)priv->rsc_table;
 
-- 
2.51.0