[PATCH] ASoC: SOF: topology: Add const to tplg_files allocation type

[PATCH] ASoC: SOF: topology: Add const to tplg_files allocation type

[Kees Cook]

From: Kees Cook <kees+treewide@kernel.org>

In preparation for converting the kmalloc family of allocators to the
type-aware kmalloc_obj family, we need to make sure that the returned
type from the allocation matches the type of the variable being
assigned. (The kmalloc family returns "void *", which can be implicitly
cast to any pointer type.)

The assigned type is "const char **", but the converted allocation type
would be "char **", which is the same type without the const qualifier.
As there is no general way to safely add const qualifiers, take the size
from the assignment target instead. No change in allocation size
results.

Build tested ARCH=x86_64 allmodconfig with GCC 16.2.0:
sound/soc/sof/topology.o

Assisted-by: LLM coccinelle
Signed-off-by: Kees Cook <kees+treewide@kernel.org>
---
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Cc: Bard Liao <yung-chuan.liao@linux.intel.com>
Cc: Daniel Baluta <daniel.baluta@nxp.com>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Cc: Vijendar Mukunda <Vijendar.Mukunda@amd.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: <sound-open-firmware@alsa-project.org>
Cc: <linux-sound@vger.kernel.org>
---
 sound/soc/sof/topology.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/topology.c b/sound/soc/sof/topology.c
index 8338133899ab..145bad472118 100644
--- a/sound/soc/sof/topology.c
+++ b/sound/soc/sof/topology.c
@@ -2517,7 +2517,8 @@ int snd_sof_load_topology(struct snd_soc_component *scomp, const char *file)
 	int i;
 
 	const char **tplg_files __free(kfree) =
-		kcalloc(scomp->card->num_links, sizeof(char *), GFP_KERNEL);
+		kcalloc(scomp->card->num_links, sizeof(*tplg_files),
+			GFP_KERNEL);
 	if (!tplg_files)
 		return -ENOMEM;
 
-- 
2.34.1