ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()

[ Upstream commit 7833810 ]

The sma1307->set.header_size is how many integers are in the header
(there are 8 of them) but instead of allocating space of 8 integers
we allocate 8 bytes.  This leads to memory corruption when we copy data
it on the next line:

        memcpy(sma1307->set.header, data,
               sma1307->set.header_size * sizeof(int));

Also since we're immediately copying over the memory in ->set.header,
there is no need to zero it in the allocator.  Use devm_kmalloc_array()
to allocate the memory instead.

Fixes: 576c57e ("ASoC: sma1307: Add driver for Iron Device SMA1307")
Signed-off-by: Dan Carpenter <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: Dan Carpenter

sound/soc/codecs/sma1307.c

@@ -1737,9 +1737,10 @@ static void sma1307_setting_loaded(struct sma1307_priv *sma1307, const char *fil
 	sma1307->set.checksum = data[sma1307->set.header_size - 2];
 	sma1307->set.num_mode = data[sma1307->set.header_size - 1];
 	num_mode = sma1307->set.num_mode;
-	sma1307->set.header = devm_kzalloc(sma1307->dev,
-					   sma1307->set.header_size,
-					   GFP_KERNEL);
+	sma1307->set.header = devm_kmalloc_array(sma1307->dev,
+						 sma1307->set.header_size,
+						 sizeof(int),
+						 GFP_KERNEL);
 	if (!sma1307->set.header) {
 		sma1307->set.status = false;
 		return;