linux-kernel - [PATCH] ASoC: amd: acp: Fix potential null pointer dereference of "adata"

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Message-Id: <20241106055720.208057-1-luoyifan@cmss.chinamobile.com>
Date: Wed,  6 Nov 2024 13:57:20 +0800
From: Luo Yifan <luoyifan@...s.chinamobile.com>
To: lgirdwood@...il.com,
	broonie@...nel.org,
	perex@...ex.cz,
	tiwai@...e.com
Cc: linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Luo Yifan <luoyifan@...s.chinamobile.com>
Subject: [PATCH] ASoC: amd: acp: Fix potential null pointer dereference of "adata"

The condition `!adata` indicates a possible null pointer dereference
for the "adata" parameter. To address this, the access to "adata"
members has been moved after the null check to ensure safer handling.

Signed-off-by: Luo Yifan <luoyifan@...s.chinamobile.com>
---
 sound/soc/amd/acp/acp-platform.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/amd/acp/acp-platform.c b/sound/soc/amd/acp/acp-platform.c
index 3a7a467b7..2acb08073 100644
--- a/sound/soc/amd/acp/acp-platform.c
+++ b/sound/soc/amd/acp/acp-platform.c
@@ -137,7 +137,7 @@ EXPORT_SYMBOL_NS_GPL(acp_machine_select, SND_SOC_ACP_COMMON);
 static irqreturn_t i2s_irq_handler(int irq, void *data)
 {
 	struct acp_dev_data *adata = data;
-	struct acp_resource *rsrc = adata->rsrc;
+	struct acp_resource *rsrc;
 	struct acp_stream *stream;
 	u16 i2s_flag = 0;
 	u32 ext_intr_stat, ext_intr_stat1;
@@ -145,6 +145,8 @@ static irqreturn_t i2s_irq_handler(int irq, void *data)
 	if (!adata)
 		return IRQ_NONE;
 
+	rsrc = adata->rsrc;
+
 	if (adata->rsrc->no_of_ctrls == 2)
 		ext_intr_stat1 = readl(ACP_EXTERNAL_INTR_STAT(adata, (rsrc->irqp_used - 1)));
 
-- 
2.27.0