linux-kernel - [PATCH] sound/core/seq: Initialize structure pointer to NULL to prevent undefined behavior

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Message-ID: <20251002174301.15512-1-hariconscious@gmail.com>
Date: Thu,  2 Oct 2025 23:13:00 +0530
From: hariconscious@...il.com
To: perex@...ex.cz,
	tiwai@...e.com
Cc: khalid@...nel.org,
	shuah@...nel.org,
	david.hunter.linux@...il.com,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	HariKrishna Sagala <hariconscious@...il.com>
Subject: [PATCH] sound/core/seq: Initialize structure pointer to NULL to prevent undefined behavior

From: HariKrishna Sagala <hariconscious@...il.com>

This change ensures the structure pointer is explicitly initialized to
NULL,preventing potential access to uninitialized memory. It improves
code safety and avoids undefined behavior during pointer dereferencing.

Signed-off-by: HariKrishna Sagala <hariconscious@...il.com>
---

Note:
Turned on the settings needed for sequencer MIDI and built a kernel
image with those settings. The system booted up fine with no errors.
However, couldn’t get the sequencer emulation to start.

 sound/core/seq/seq_midi_emul.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/core/seq/seq_midi_emul.c b/sound/core/seq/seq_midi_emul.c
index 81d2ef5e5811..f24c5a475c41 100644
--- a/sound/core/seq/seq_midi_emul.c
+++ b/sound/core/seq/seq_midi_emul.c
@@ -647,7 +647,7 @@ static void snd_midi_channel_init(struct snd_midi_channel *p, int n)
  */
 static struct snd_midi_channel *snd_midi_channel_init_set(int n)
 {
-	struct snd_midi_channel *chan;
+	struct snd_midi_channel *chan = NULL;
 	int  i;
 
 	chan = kmalloc_array(n, sizeof(struct snd_midi_channel), GFP_KERNEL);
@@ -686,7 +686,7 @@ reset_all_channels(struct snd_midi_channel_set *chset)
  */
 struct snd_midi_channel_set *snd_midi_channel_alloc_set(int n)
 {
-	struct snd_midi_channel_set *chset;
+	struct snd_midi_channel_set *chset = NULL;
 
 	chset = kmalloc(sizeof(*chset), GFP_KERNEL);
 	if (chset) {

base-commit: 50c19e20ed2ef359cf155a39c8462b0a6351b9fa
-- 
2.43.0