[PATCH next] ASoC: sma1307: Fix error handling in sma1307_setting_loaded()

[Dan Carpenter]

There are a couple bugs in this code:

1) The cleanup code calls kfree(sma1307->set.header) and
   kfree(sma1307->set.def) but those functions were allocated using
   devm_kzalloc().  It results in a double free.  Delete all these
   kfree() calls.

2) A missing call to kfree(data) if the checksum was wrong on this error
   path:
	if ((sma1307->set.checksum >> 8) != SMA1307_SETTING_CHECKSUM) {
   Since the "data" pointer is supposed to be freed on every return, I
   changed that to use the __free(kfree) cleanup attribute.

Fixes: 0ec6bd16705f ("ASoC: sma1307: Add NULL check in sma1307_setting_loaded()")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 sound/soc/codecs/sma1307.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/sound/soc/codecs/sma1307.c b/sound/soc/codecs/sma1307.c
index f5c303d4bb62..498189ab691c 100644
--- a/sound/soc/codecs/sma1307.c
+++ b/sound/soc/codecs/sma1307.c
@@ -1705,7 +1705,7 @@ static void sma1307_check_fault_worker(struct work_struct *work)
 static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *file)
 {
 	const struct firmware *fw;
-	int *data, size, offset, num_mode;
+	int size, offset, num_mode;
 	int ret;
 
 	ret = request_firmware(&fw, file, sma1307->dev);
@@ -1722,7 +1722,7 @@ static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *fil
 		return;
 	}
 
-	data = kzalloc(fw->size, GFP_KERNEL);
+	int *data __free(kfree) = kzalloc(fw->size, GFP_KERNEL);
 	if (!data) {
 		release_firmware(fw);
 		sma1307->set.status = false;
@@ -1742,7 +1742,6 @@ static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *fil
 					   sma1307->set.header_size,
 					   GFP_KERNEL);
 	if (!sma1307->set.header) {
-		kfree(data);
 		sma1307->set.status = false;
 		return;
 	}
@@ -1763,8 +1762,6 @@ static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *fil
 	    = devm_kzalloc(sma1307->dev,
 			   sma1307->set.def_size * sizeof(int), GFP_KERNEL);
 	if (!sma1307->set.def) {
-		kfree(data);
-		kfree(sma1307->set.header);
 		sma1307->set.status = false;
 		return;
 	}
@@ -1782,9 +1779,6 @@ static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *fil
 				   sma1307->set.mode_size * 2 * sizeof(int),
 				   GFP_KERNEL);
 		if (!sma1307->set.mode_set[i]) {
-			kfree(data);
-			kfree(sma1307->set.header);
-			kfree(sma1307->set.def);
 			for (int j = 0; j < i; j++)
 				kfree(sma1307->set.mode_set[j]);
 			sma1307->set.status = false;
@@ -1799,7 +1793,6 @@ static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *fil
 		}
 	}
 
-	kfree(data);
 	sma1307->set.status = true;
 
 }
-- 
2.47.2