[PATCH AUTOSEL for 4.9 092/156] ASoC: Intel: Skylake: Fix uuid_module memory leak in failure case

[alexander . levin]

From: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@xxxxxxxxx>

[ Upstream commit f8e066521192c7debe59127d90abbe2773577e25 ]

In the loop that adds the uuid_module to the uuid_list list, allocated
memory is not properly freed in the error path free uuid_list whenever
any of the memory allocation in the loop fails to avoid memory leak.

Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@xxxxxxxxx>
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@xxxxxxxxx>
Acked-By: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 sound/soc/intel/skylake/skl-sst-utils.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-sst-utils.c b/sound/soc/intel/skylake/skl-sst-utils.c
index ea162fbf68e5..d5adc04bb724 100644
--- a/sound/soc/intel/skylake/skl-sst-utils.c
+++ b/sound/soc/intel/skylake/skl-sst-utils.c
@@ -295,6 +295,7 @@ int snd_skl_parse_uuids(struct sst_dsp *ctx, const struct firmware *fw,
 	struct uuid_module *module;
 	struct firmware stripped_fw;
 	unsigned int safe_file;
+	int ret = 0;
 
 	/* Get the FW pointer to derive ADSP header */
 	stripped_fw.data = fw->data;
@@ -343,8 +344,10 @@ int snd_skl_parse_uuids(struct sst_dsp *ctx, const struct firmware *fw,
 
 	for (i = 0; i < num_entry; i++, mod_entry++) {
 		module = kzalloc(sizeof(*module), GFP_KERNEL);
-		if (!module)
-			return -ENOMEM;
+		if (!module) {
+			ret = -ENOMEM;
+			goto free_uuid_list;
+		}
 
 		uuid_bin = (uuid_le *)mod_entry->uuid.id;
 		memcpy(&module->uuid, uuid_bin, sizeof(module->uuid));
@@ -355,8 +358,8 @@ int snd_skl_parse_uuids(struct sst_dsp *ctx, const struct firmware *fw,
 		size = sizeof(int) * mod_entry->instance_max_count;
 		module->instance_id = devm_kzalloc(ctx->dev, size, GFP_KERNEL);
 		if (!module->instance_id) {
-			kfree(module);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto free_uuid_list;
 		}
 
 		list_add_tail(&module->list, &skl->uuid_list);
@@ -367,6 +370,10 @@ int snd_skl_parse_uuids(struct sst_dsp *ctx, const struct firmware *fw,
 	}
 
 	return 0;
+
+free_uuid_list:
+	skl_freeup_uuid_list(skl);
+	return ret;
 }
 
 void skl_freeup_uuid_list(struct skl_sst *ctx)
-- 
2.11.0