[PATCH] ASoC: SOF: ipc4-topology: Use size_t for variable passed to kzalloc()

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
To: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Peter Ujfalusi <peter.ujfalusi@linux.intel.com>,
	Bard Liao <yung-chuan.liao@linux.intel.com>,
	Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
	Daniel Baluta <daniel.baluta@nxp.com>,
	Kai Vehmanen <kai.vehmanen@linux.intel.com>,
	Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>,
	Takashi Iwai <tiwai@suse.com>
Cc: linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org,
	Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
	sound-open-firmware@alsa-project.org,
	alsa-devel@alsa-project.org
Subject: [PATCH] ASoC: SOF: ipc4-topology: Use size_t for variable passed to kzalloc()
Date: Thu,  1 Jun 2023 19:30:12 +0200	[thread overview]
Message-ID: <a311e4ae83406f714c9d1f7f2f857284265e581c.1685640591.git.christophe.jaillet@wanadoo.fr> (raw)

struct_size() checks for overflow, but assigning its result to just a u32
may still overflow after a successful check.

Use a size_t instead in order to be cleaner.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
Based on analysis from Dan Carpenter on another patch (see [1]).

[1]: https://lore.kernel.org/all/00e84595-e2c9-48ea-8737-18da34eaafbf@kili.mountain/
---
 sound/soc/sof/ipc4-topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sof/ipc4-topology.c b/sound/soc/sof/ipc4-topology.c
index db64e0cb8663..50faa4c88b97 100644
--- a/sound/soc/sof/ipc4-topology.c
+++ b/sound/soc/sof/ipc4-topology.c
@@ -881,7 +881,7 @@ static int sof_ipc4_widget_setup_comp_process(struct snd_sof_widget *swidget)
 	/* allocate memory for base config extension if needed */
 	if (process->init_config == SOF_IPC4_MODULE_INIT_CONFIG_TYPE_BASE_CFG_WITH_EXT) {
 		struct sof_ipc4_base_module_cfg_ext *base_cfg_ext;
-		u32 ext_size = struct_size(base_cfg_ext, pin_formats,
+		size_t ext_size = struct_size(base_cfg_ext, pin_formats,
 						swidget->num_input_pins + swidget->num_output_pins);
 
 		base_cfg_ext = kzalloc(ext_size, GFP_KERNEL);
-- 
2.34.1

