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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Guenter Roeck <linux@roeck-us.net>,
        Alan Tull <atull@kernel.org>,
        Frank Rowand <frank.rowand@sony.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 241/306] of: unittest: initialize args before calling of_*parse_*()
Date:   Wed, 27 Nov 2019 21:31:31 +0100
Message-Id: <20191127203132.576575032@linuxfoundation.org>
In-Reply-To: <20191127203114.766709977@linuxfoundation.org>
References: <20191127203114.766709977@linuxfoundation.org>
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From: Frank Rowand <frank.rowand@sony.com>

[ Upstream commit eeb07c573ec307c53fe2f6ac6d8d11c261f64006 ]

Callers of of_irq_parse_one() blindly use the pointer args.np
without checking whether of_irq_parse_one() had an error and
thus did not set the value of args.np.  Initialize args to
zero so that using the format "%pOF" to show the value of
args.np will show "(null)" when of_irq_parse_one() has an
error.  This prevents the dereference of a random value.

Make the same fix for callers of of_parse_phandle_with_args()
and of_parse_phandle_with_args_map().

Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Alan Tull <atull@kernel.org>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/of/unittest.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index e8997cdb228cb..68f52966bbc04 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -375,6 +375,7 @@ static void __init of_unittest_parse_phandle_with_args(void)
 	for (i = 0; i < 8; i++) {
 		bool passed = true;
 
+		memset(&args, 0, sizeof(args));
 		rc = of_parse_phandle_with_args(np, "phandle-list",
 						"#phandle-cells", i, &args);
 
@@ -428,6 +429,7 @@ static void __init of_unittest_parse_phandle_with_args(void)
 	}
 
 	/* Check for missing list property */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args(np, "phandle-list-missing",
 					"#phandle-cells", 0, &args);
 	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
@@ -436,6 +438,7 @@ static void __init of_unittest_parse_phandle_with_args(void)
 	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 
 	/* Check for missing cells property */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args(np, "phandle-list",
 					"#phandle-cells-missing", 0, &args);
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
@@ -444,6 +447,7 @@ static void __init of_unittest_parse_phandle_with_args(void)
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for bad phandle in list */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args(np, "phandle-list-bad-phandle",
 					"#phandle-cells", 0, &args);
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
@@ -452,6 +456,7 @@ static void __init of_unittest_parse_phandle_with_args(void)
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for incorrectly formed argument list */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args(np, "phandle-list-bad-args",
 					"#phandle-cells", 1, &args);
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
@@ -502,6 +507,7 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
 	for (i = 0; i < 8; i++) {
 		bool passed = true;
 
+		memset(&args, 0, sizeof(args));
 		rc = of_parse_phandle_with_args_map(np, "phandle-list",
 						    "phandle", i, &args);
 
@@ -559,21 +565,25 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
 	}
 
 	/* Check for missing list property */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args_map(np, "phandle-list-missing",
 					    "phandle", 0, &args);
 	unittest(rc == -ENOENT, "expected:%i got:%i\n", -ENOENT, rc);
 
 	/* Check for missing cells,map,mask property */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args_map(np, "phandle-list",
 					    "phandle-missing", 0, &args);
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for bad phandle in list */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-phandle",
 					    "phandle", 0, &args);
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
 
 	/* Check for incorrectly formed argument list */
+	memset(&args, 0, sizeof(args));
 	rc = of_parse_phandle_with_args_map(np, "phandle-list-bad-args",
 					    "phandle", 1, &args);
 	unittest(rc == -EINVAL, "expected:%i got:%i\n", -EINVAL, rc);
@@ -783,7 +793,7 @@ static void __init of_unittest_parse_interrupts(void)
 	for (i = 0; i < 4; i++) {
 		bool passed = true;
 
-		args.args_count = 0;
+		memset(&args, 0, sizeof(args));
 		rc = of_irq_parse_one(np, i, &args);
 
 		passed &= !rc;
@@ -804,7 +814,7 @@ static void __init of_unittest_parse_interrupts(void)
 	for (i = 0; i < 4; i++) {
 		bool passed = true;
 
-		args.args_count = 0;
+		memset(&args, 0, sizeof(args));
 		rc = of_irq_parse_one(np, i, &args);
 
 		/* Test the values from tests-phandle.dtsi */
@@ -860,6 +870,7 @@ static void __init of_unittest_parse_interrupts_extended(void)
 	for (i = 0; i < 7; i++) {
 		bool passed = true;
 
+		memset(&args, 0, sizeof(args));
 		rc = of_irq_parse_one(np, i, &args);
 
 		/* Test the values from tests-phandle.dtsi */
-- 
2.20.1