This is a note to let you know that I've just added the patch titled
of: Fix double free in of_parse_phandle_with_args_map
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
of-fix-double-free-in-of_parse_phandle_with_args_map.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fbbdc48945af6a68e1fc70ab099f1fd25c7ed111
Author: Christian A. Ehrhardt <lk@xxxxxxx>
Date: Fri Dec 29 11:54:11 2023 +0100
of: Fix double free in of_parse_phandle_with_args_map
[ Upstream commit 4dde83569832f9377362e50f7748463340c5db6b ]
In of_parse_phandle_with_args_map() the inner loop that
iterates through the map entries calls of_node_put(new)
to free the reference acquired by the previous iteration
of the inner loop. This assumes that the value of "new" is
NULL on the first iteration of the inner loop.
Make sure that this is true in all iterations of the outer
loop by setting "new" to NULL after its value is assigned to "cur".
Extend the unittest to detect the double free and add an additional
test case that actually triggers this path.
Fixes: bd6f2fd5a1 ("of: Support parsing phandle argument lists through a nexus node")
Cc: Stephen Boyd <stephen.boyd@xxxxxxxxxx>
Signed-off-by: "Christian A. Ehrhardt" <lk@xxxxxxx>
Link: https://lore.kernel.org/r/20231229105411.1603434-1-lk@xxxxxxx
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/of/base.c b/drivers/of/base.c
index f0dbb7ad88cf..3925da5690d3 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1634,6 +1634,7 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
out_args->np = new;
of_node_put(cur);
cur = new;
+ new = NULL;
}
put:
of_node_put(cur);
diff --git a/drivers/of/unittest-data/tests-phandle.dtsi b/drivers/of/unittest-data/tests-phandle.dtsi
index 6b33be4c4416..aa0d7027ffa6 100644
--- a/drivers/of/unittest-data/tests-phandle.dtsi
+++ b/drivers/of/unittest-data/tests-phandle.dtsi
@@ -38,6 +38,13 @@ provider4: provider4 {
phandle-map-pass-thru = <0x0 0xf0>;
};
+ provider5: provider5 {
+ #phandle-cells = <2>;
+ phandle-map = <2 7 &provider4 2 3>;
+ phandle-map-mask = <0xff 0xf>;
+ phandle-map-pass-thru = <0x0 0xf0>;
+ };
+
consumer-a {
phandle-list = <&provider1 1>,
<&provider2 2 0>,
@@ -64,7 +71,8 @@ consumer-b {
<&provider4 4 0x100>,
<&provider4 0 0x61>,
<&provider0>,
- <&provider4 19 0x20>;
+ <&provider4 19 0x20>,
+ <&provider5 2 7>;
phandle-list-bad-phandle = <12345678 0 0>;
phandle-list-bad-args = <&provider2 1 0>,
<&provider4 0>;
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 2515ce393005..52f2943be5b5 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -426,6 +426,9 @@ static void __init of_unittest_parse_phandle_with_args(void)
unittest(passed, "index %i - data error on node %pOF rc=%i\n",
i, args.np, rc);
+
+ if (rc == 0)
+ of_node_put(args.np);
}
/* Check for missing list property */
@@ -467,8 +470,9 @@ static void __init of_unittest_parse_phandle_with_args(void)
static void __init of_unittest_parse_phandle_with_args_map(void)
{
- struct device_node *np, *p0, *p1, *p2, *p3;
+ struct device_node *np, *p[6] = {};
struct of_phandle_args args;
+ unsigned int prefs[6];
int i, rc;
np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-b");
@@ -477,34 +481,24 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
return;
}
- p0 = of_find_node_by_path("/testcase-data/phandle-tests/provider0");
- if (!p0) {
- pr_err("missing testcase data\n");
- return;
- }
-
- p1 = of_find_node_by_path("/testcase-data/phandle-tests/provider1");
- if (!p1) {
- pr_err("missing testcase data\n");
- return;
- }
-
- p2 = of_find_node_by_path("/testcase-data/phandle-tests/provider2");
- if (!p2) {
- pr_err("missing testcase data\n");
- return;
- }
-
- p3 = of_find_node_by_path("/testcase-data/phandle-tests/provider3");
- if (!p3) {
- pr_err("missing testcase data\n");
- return;
+ p[0] = of_find_node_by_path("/testcase-data/phandle-tests/provider0");
+ p[1] = of_find_node_by_path("/testcase-data/phandle-tests/provider1");
+ p[2] = of_find_node_by_path("/testcase-data/phandle-tests/provider2");
+ p[3] = of_find_node_by_path("/testcase-data/phandle-tests/provider3");
+ p[4] = of_find_node_by_path("/testcase-data/phandle-tests/provider4");
+ p[5] = of_find_node_by_path("/testcase-data/phandle-tests/provider5");
+ for (i = 0; i < ARRAY_SIZE(p); ++i) {
+ if (!p[i]) {
+ pr_err("missing testcase data\n");
+ return;
+ }
+ prefs[i] = kref_read(&p[i]->kobj.kref);
}
rc = of_count_phandle_with_args(np, "phandle-list", "#phandle-cells");
- unittest(rc == 7, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
+ unittest(rc == 8, "of_count_phandle_with_args() returned %i, expected 7\n", rc);
- for (i = 0; i < 8; i++) {
+ for (i = 0; i < 9; i++) {
bool passed = true;
memset(&args, 0, sizeof(args));
@@ -515,13 +509,13 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
switch (i) {
case 0:
passed &= !rc;
- passed &= (args.np == p1);
+ passed &= (args.np == p[1]);
passed &= (args.args_count == 1);
passed &= (args.args[0] == 1);
break;
case 1:
passed &= !rc;
- passed &= (args.np == p3);
+ passed &= (args.np == p[3]);
passed &= (args.args_count == 3);
passed &= (args.args[0] == 2);
passed &= (args.args[1] == 5);
@@ -532,28 +526,36 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
break;
case 3:
passed &= !rc;
- passed &= (args.np == p0);
+ passed &= (args.np == p[0]);
passed &= (args.args_count == 0);
break;
case 4:
passed &= !rc;
- passed &= (args.np == p1);
+ passed &= (args.np == p[1]);
passed &= (args.args_count == 1);
passed &= (args.args[0] == 3);
break;
case 5:
passed &= !rc;
- passed &= (args.np == p0);
+ passed &= (args.np == p[0]);
passed &= (args.args_count == 0);
break;
case 6:
passed &= !rc;
- passed &= (args.np == p2);
+ passed &= (args.np == p[2]);
passed &= (args.args_count == 2);
passed &= (args.args[0] == 15);
passed &= (args.args[1] == 0x20);
break;
case 7:
+ passed &= !rc;
+ passed &= (args.np == p[3]);
+ passed &= (args.args_count == 3);
+ passed &= (args.args[0] == 2);
+ passed &= (args.args[1] == 5);
+ passed &= (args.args[2] == 3);
+ break;
+ case 8:
passed &= (rc == -ENOENT);
break;
default:
@@ -562,6 +564,9 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
unittest(passed, "index %i - data error on node %s rc=%i\n",
i, args.np->full_name, rc);
+
+ if (rc == 0)
+ of_node_put(args.np);
}
/* Check for missing list property */
@@ -587,6 +592,13 @@ static void __init of_unittest_parse_phandle_with_args_map(void)
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);
+
+ for (i = 0; i < ARRAY_SIZE(p); ++i) {
+ unittest(prefs[i] == kref_read(&p[i]->kobj.kref),
+ "provider%d: expected:%d got:%d\n",
+ i, prefs[i], kref_read(&p[i]->kobj.kref));
+ of_node_put(p[i]);
+ }
}
static void __init of_unittest_property_string(void)
