of: unittest: initialize args before calling of_*parse_*()

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>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index fe01c5869b0f..9a10a48eb6a1 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -379,6 +379,7 @@ 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);
 
@@ -432,6 +433,7 @@ 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);
@@ -440,6 +442,7 @@ 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);
@@ -448,6 +451,7 @@ 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);
@@ -456,6 +460,7 @@ 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);
@@ -506,6 +511,7 @@ 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);
 
@@ -563,21 +569,25 @@ 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);
@@ -787,7 +797,7 @@ 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;
@@ -808,7 +818,7 @@ 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 */
@@ -864,6 +874,7 @@ 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 */