linux-kernel - [PATCH AUTOSEL 6.1 20/34] ALSA: asihpi: check pao in control

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Date:   Wed, 22 Mar 2023 15:59:12 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>,
        perex@...ex.cz, tiwai@...e.com, dengshaomin@...rlc.com,
        alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.1 20/34] ALSA: asihpi: check pao in control_message()

From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

[ Upstream commit 9026c0bf233db53b86f74f4c620715e94eb32a09 ]

control_message() might be called with pao = NULL.
Here indicates control_message() as sample.

(B)	static void control_message(struct hpi_adapter_obj *pao, ...)
	{                                                   ^^^
		struct hpi_hw_obj *phw = pao->priv;
		...                      ^^^
	}

(A)	void _HPI_6205(struct hpi_adapter_obj *pao, ...)
	{                                      ^^^
		...
		case HPI_OBJ_CONTROL:
(B)			control_message(pao, phm, phr);
			break;          ^^^
		...
	}

	void HPI_6205(...)
	{
		...
(A)		_HPI_6205(NULL, phm, phr);
		...       ^^^^
	}

Therefore, We will get too many warning via cppcheck, like below

	sound/pci/asihpi/hpi6205.c:238:27: warning: Possible null pointer dereference: pao [nullPointer]
		 struct hpi_hw_obj *phw = pao->priv;
		                          ^
	sound/pci/asihpi/hpi6205.c:433:13: note: Calling function '_HPI_6205', 1st argument 'NULL' value is 0
		  _HPI_6205(NULL, phm, phr);
		            ^
	sound/pci/asihpi/hpi6205.c:401:20: note: Calling function 'control_message', 1st argument 'pao' value is 0
	   control_message(pao, phm, phr);
	                   ^
Set phr->error like many functions doing, and don't call _HPI_6205()
with NULL.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Link: https://lore.kernel.org/r/87ttypeaqz.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/asihpi/hpi6205.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/pci/asihpi/hpi6205.c b/sound/pci/asihpi/hpi6205.c
index 27e11b5f70b97..c7d7eff86727f 100644
--- a/sound/pci/asihpi/hpi6205.c
+++ b/sound/pci/asihpi/hpi6205.c
@@ -430,7 +430,7 @@ void HPI_6205(struct hpi_message *phm, struct hpi_response *phr)
 		pao = hpi_find_adapter(phm->adapter_index);
 	} else {
 		/* subsys messages don't address an adapter */
-		_HPI_6205(NULL, phm, phr);
+		phr->error = HPI_ERROR_INVALID_OBJ_INDEX;
 		return;
 	}
 
-- 
2.39.2