linux-kernel - [PATCH] ASoC: cs-amp-lib: Fix NULL pointer crash if efi.get

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Message-ID: <20240805114222.15722-1-rf@opensource.cirrus.com>
Date: Mon, 5 Aug 2024 12:42:22 +0100
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: <broonie@...nel.org>
CC: <linux-sound@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Richard Fitzgerald
	<rf@...nsource.cirrus.com>
Subject: [PATCH] ASoC: cs-amp-lib: Fix NULL pointer crash if efi.get_variable is NULL

Call efi_rt_services_supported() to check that efi.get_variable exists
before calling it.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 1cad8725f2b9 ("ASoC: cs-amp-lib: Add helpers for factory calibration data")
---
 sound/soc/codecs/cs-amp-lib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cs-amp-lib.c b/sound/soc/codecs/cs-amp-lib.c
index 287ac01a3873..605964af8afa 100644
--- a/sound/soc/codecs/cs-amp-lib.c
+++ b/sound/soc/codecs/cs-amp-lib.c
@@ -108,7 +108,7 @@ static efi_status_t cs_amp_get_efi_variable(efi_char16_t *name,
 
 	KUNIT_STATIC_STUB_REDIRECT(cs_amp_get_efi_variable, name, guid, size, buf);
 
-	if (IS_ENABLED(CONFIG_EFI))
+	if (efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
 		return efi.get_variable(name, guid, &attr, size, buf);
 
 	return EFI_NOT_FOUND;
-- 
2.39.2