linux-kernel - [PATCH] line6: add midibuf init failure handling in line6_init

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Message-Id: <20240516174737.415912-1-yskelg@gmail.com>
Date: Fri, 17 May 2024 02:47:38 +0900
From: yskelg@...il.com
To: Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>
Cc: skhan@...uxfoundation.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	Austin Kim <austindh.kim@...il.com>,
	shjy180909@...il.com,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yunseong Kim <yskelg@...il.com>
Subject: [PATCH] line6: add midibuf init failure handling in line6_init_midi()

From: Yunseong Kim <yskelg@...il.com>

This patch fixes potential memory allocation failures in the
line6_midibuf_init(). If either midibuf_in, midibuf_out allocation
line6_midibuf_init call failed, the allocated memory for line6midi
might have been leaked.

This patch introduces an error handling label and uses goto to jump there
in case of allocation failures. A kfree call is added to release any
partially allocated memory before returning the error code.

Signed-off-by: Yunseong Kim <yskelg@...il.com>
---
 sound/usb/line6/midi.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/usb/line6/midi.c b/sound/usb/line6/midi.c
index 0838632c788e..abcf58f46673 100644
--- a/sound/usb/line6/midi.c
+++ b/sound/usb/line6/midi.c
@@ -283,13 +283,18 @@ int line6_init_midi(struct usb_line6 *line6)
 
 	err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
 	if (err < 0)
-		return err;
+		goto error;
 
 	err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
 	if (err < 0)
-		return err;
+		goto error;
 
 	line6->line6midi = line6midi;
 	return 0;
+
+error:
+	kfree(line6midi);
+	return err;
+
 }
 EXPORT_SYMBOL_GPL(line6_init_midi);
-- 
2.34.1