of: Use scope based kfree() cleanups

Use the relatively new scope based kfree() cleanup to simplify error
handling. Doing so reduces the chances of memory leaks and simplifies
error paths by avoiding the need for goto statements.

Reviewed-by: Saravana Kannan <saravanak@google.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20240409-dt-cleanup-free-v2-2-5b419a4af38d@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 8 insertions, 26 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 8856c67c466a..20603d3c9931 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -16,6 +16,7 @@
 
 #define pr_fmt(fmt)	"OF: " fmt
 
+#include <linux/cleanup.h>
 #include <linux/console.h>
 #include <linux/ctype.h>
 #include <linux/cpu.h>
@@ -1393,8 +1394,10 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
 				   const char *stem_name,
 				   int index, struct of_phandle_args *out_args)
 {
-	char *cells_name, *map_name = NULL, *mask_name = NULL;
-	char *pass_name = NULL;
+	char *cells_name __free(kfree) = kasprintf(GFP_KERNEL, "#%s-cells", stem_name);
+	char *map_name __free(kfree) = kasprintf(GFP_KERNEL, "%s-map", stem_name);
+	char *mask_name __free(kfree) = kasprintf(GFP_KERNEL, "%s-map-mask", stem_name);
+	char *pass_name __free(kfree) = kasprintf(GFP_KERNEL, "%s-map-pass-thru", stem_name);
 	struct device_node *cur, *new = NULL;
 	const __be32 *map, *mask, *pass;
 	static const __be32 dummy_mask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) };
@@ -1407,27 +1410,13 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
 	if (index < 0)
 		return -EINVAL;
 
-	cells_name = kasprintf(GFP_KERNEL, "#%s-cells", stem_name);
-	if (!cells_name)
+	if (!cells_name || !map_name || !mask_name || !pass_name)
 		return -ENOMEM;
 
-	ret = -ENOMEM;
-	map_name = kasprintf(GFP_KERNEL, "%s-map", stem_name);
-	if (!map_name)
-		goto free;
-
-	mask_name = kasprintf(GFP_KERNEL, "%s-map-mask", stem_name);
-	if (!mask_name)
-		goto free;
-
-	pass_name = kasprintf(GFP_KERNEL, "%s-map-pass-thru", stem_name);
-	if (!pass_name)
-		goto free;
-
 	ret = __of_parse_phandle_with_args(np, list_name, cells_name, -1, index,
 					   out_args);
 	if (ret)
-		goto free;
+		return ret;
 
 	/* Get the #<list>-cells property */
 	cur = out_args->np;
@@ -1444,8 +1433,7 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
 		/* Get the <list>-map property */
 		map = of_get_property(cur, map_name, &map_len);
 		if (!map) {
-			ret = 0;
-			goto free;
+			return 0;
 		}
 		map_len /= sizeof(u32);
 
@@ -1521,12 +1509,6 @@ int of_parse_phandle_with_args_map(const struct device_node *np,
 put:
 	of_node_put(cur);
 	of_node_put(new);
-free:
-	kfree(mask_name);
-	kfree(map_name);
-	kfree(cells_name);
-	kfree(pass_name);
-
 	return ret;
 }
 EXPORT_SYMBOL(of_parse_phandle_with_args_map);