linux-kernel - [PATCH] platform/chrome: cros_ec_lpc: initialize the buf variable

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Message-Id: <20230110193611.3573777-1-trix@redhat.com>
Date:   Tue, 10 Jan 2023 14:36:11 -0500
From:   Tom Rix <trix@...hat.com>
To:     bleung@...omium.org, groeck@...omium.org, nathan@...nel.org,
        ndesaulniers@...gle.com
Cc:     chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, Tom Rix <trix@...hat.com>
Subject: [PATCH] platform/chrome: cros_ec_lpc: initialize the buf variable

Clang static analysis reports this problem
drivers/platform/chrome/cros_ec_lpc.c:379:13: warning: The left operand
  of '!=' is a garbage value [core.UndefinedBinaryOperatorResult]
    if (buf[0] != 'E' || buf[1] != 'C') {
         ~~~~~~ ^

The check depends on the side effect of the read.  When the read fails
or is short, a buf containing garbage could be mistaken as correct.

Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/platform/chrome/cros_ec_lpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c
index 3708fa75feb1..68bba0fcafab 100644
--- a/drivers/platform/chrome/cros_ec_lpc.c
+++ b/drivers/platform/chrome/cros_ec_lpc.c
@@ -350,7 +350,7 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
 	struct acpi_device *adev;
 	acpi_status status;
 	struct cros_ec_device *ec_dev;
-	u8 buf[2];
+	u8 buf[2] = {};
 	int irq, ret;
 
 	/*
-- 
2.27.0