linux-kernel - [PATCH] ASoC: kirkwood: Fix potential NULL dereference

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Date: Thu, 28 Mar 2024 20:33:37 +0300
From: Aleksandr Mishin <amishin@...rgos.ru>
To: Liam Girdwood <lgirdwood@...il.com>
CC: Aleksandr Mishin <amishin@...rgos.ru>, Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>, Kuninori
 Morimoto <kuninori.morimoto.gx@...esas.com>, <linux-sound@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <lvc-project@...uxtesting.org>
Subject: [PATCH] ASoC: kirkwood: Fix potential NULL dereference

In kirkwood_dma_hw_params() mv_mbus_dram_info() returns NULL if
CONFIG_PLAT_ORION macro is not defined.
Fix this bug by adding NULL check.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: bb6a40fc5a83 ("ASoC: kirkwood: Fix reference to PCM buffer address")
Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
---
 sound/soc/kirkwood/kirkwood-dma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/kirkwood/kirkwood-dma.c b/sound/soc/kirkwood/kirkwood-dma.c
index dd2f806526c1..ef00792e1d49 100644
--- a/sound/soc/kirkwood/kirkwood-dma.c
+++ b/sound/soc/kirkwood/kirkwood-dma.c
@@ -182,6 +182,9 @@ static int kirkwood_dma_hw_params(struct snd_soc_component *component,
 	const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
 	unsigned long addr = substream->runtime->dma_addr;
 
+	if (!dram)
+		return 0;
+
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		kirkwood_dma_conf_mbus_windows(priv->io,
 			KIRKWOOD_PLAYBACK_WIN, addr, dram);
-- 
2.30.2