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Subject[PATCH v4 18/18] of: unittest: initialize args before calling of_*parse_*()
Date
From: Frank Rowand <frank.rowand@sony.com>

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>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
---
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 785985bdbfa6..5f4db23e4752 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);
@@ -780,7 +790,7 @@ 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;
@@ -801,7 +811,7 @@ 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 */
@@ -854,6 +864,7 @@ 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 */
--
Frank Rowand <frank.rowand@sony.com>
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