linux-kernel - [PATCH 3.16 29/83] ALSA: firewire: fix a memory leak bug

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Message-ID: <lsq.1574264230.903988427@decadent.org.uk>
Date:   Wed, 20 Nov 2019 15:37:39 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Takashi Sakamoto" <o-takashi@...amocchi.jp>,
        "Wenwen Wang" <wenwen@...uga.edu>, "Takashi Iwai" <tiwai@...e.de>
Subject: [PATCH 3.16 29/83] ALSA: firewire: fix a memory leak bug

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Wenwen Wang <wenwen@...uga.edu>

commit 1be3c1fae6c1e1f5bb982b255d2034034454527a upstream.

In iso_packets_buffer_init(), 'b->packets' is allocated through
kmalloc_array(). Then, the aligned packet size is checked. If it is
larger than PAGE_SIZE, -EINVAL will be returned to indicate the error.
However, the allocated 'b->packets' is not deallocated on this path,
leading to a memory leak.

To fix the above issue, free 'b->packets' before returning the error code.

Fixes: 31ef9134eb52 ("ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver")
Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
Reviewed-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/firewire/packets-buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/firewire/packets-buffer.c
+++ b/sound/firewire/packets-buffer.c
@@ -37,7 +37,7 @@ int iso_packets_buffer_init(struct iso_p
 	packets_per_page = PAGE_SIZE / packet_size;
 	if (WARN_ON(!packets_per_page)) {
 		err = -EINVAL;
-		goto error;
+		goto err_packets;
 	}
 	pages = DIV_ROUND_UP(count, packets_per_page);