[PATCH 6.1.y 2/2] ASoC: SOF: ipc4-topology: Clarify bind failure caused by missing fw_module

[Artem Dinaburg <artem@trailofbits.com>]

From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

[ Upstream commit de6aa72b265b72bca2b1897d5000c8f0147d3157 ]

The original patch uses a feature in lib/vsprintf.c to handle the invalid
address when tring to print *_fw_module->man4_module_entry.name when the
*rc_fw_module is NULL.
This case is handled by check_pointer_msg() internally and turns the
invalid pointer to '(efault)' for printing but it is hiding useful
information about the circumstances. Change the print to emmit the name
of the widget and a note on which side's fw_module is missing.

Fixes: e3720f92e023 ("ASoC: SOF: avoid a NULL dereference with unsupported widgets")
Reported-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/alsa-devel/4826f662-42f0-4a82-ba32-8bf5f8a03256@kili.mountain/
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Rule: 'Cc: stable@vger.kernel.org' or 'commit <sha1> upstream.'
Link: https://lore.kernel.org/r/20230403090909.18233-1-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

[ Backport to 6.1.y follow-up to e3720f92e023: replace its (efault)
  pointer formatting with source/sink diagnostics; only hunk locations
  differ. ]
Assisted-by: LLM
Signed-off-by: Artem Dinaburg <artem@trailofbits.com>
---
Stable submission note: patch 2/2 in the CVE-2023-54233 series for Linux
6.1.y.

CVE: CVE-2023-54233

Build: This patch was included in the x86_64 allmodconfig and
CONFIG_WERROR=y build.

 sound/soc/sof/ipc4-topology.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index 9540ba6ef659e6..ee6f6edec970c4 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -1601,10 +1601,12 @@ static int sof_ipc4_route_setup(struct snd_sof_dev *sdev, struct snd_sof_route *
 	int ret;
 
 	if (!src_fw_module || !sink_fw_module) {
-		/* The NULL module will print as "(efault)" */
-		dev_err(sdev->dev, "source %s or sink %s widget weren't set up properly\n",
-			src_fw_module->man4_module_entry.name,
-			sink_fw_module->man4_module_entry.name);
+		dev_err(sdev->dev,
+			"cannot bind %s -> %s, no firmware module for: %s%s\n",
+			src_widget->widget->name, sink_widget->widget->name,
+			src_fw_module ? "" : " source",
+			sink_fw_module ? "" : " sink");
+
 		return -ENODEV;
 	}
 
-- 
2.39.5