linux-kernel - [PATCH] soundwire: sysfs_emit() expects a buffer of size PAGE

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Message-ID: <20250723230927.109534-1-sperezglz@gmail.com>
Date: Wed, 23 Jul 2025 17:09:25 -0600
From: Sergio Perez Gonzalez <sperezglz@...il.com>
To: vkoul@...nel.org,
	yung-chuan.liao@...ux.intel.com
Cc: Sergio Perez Gonzalez <sperezglz@...il.com>,
	pierre-louis.bossart@...ux.dev,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] soundwire: sysfs_emit() expects a buffer of size PAGE_SIZE

In read_buffer_show(), allocate sufficient memory to pass on to
sysfs_emit(), which expects a buffer of size PAGE_SIZE.

Link: https://scan7.scan.coverity.com/#/project-view/53936/11354?selectedIssue=1648019
Fixes: 35323d8ab811 ("soundwire: replace scnprintf() with sysfs_emit() for sysfs consistency")
Signed-off-by: Sergio Perez Gonzalez <sperezglz@...il.com>
---
 drivers/soundwire/debugfs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/soundwire/debugfs.c b/drivers/soundwire/debugfs.c
index 825f7abbad32..08fb1e29026e 100644
--- a/drivers/soundwire/debugfs.c
+++ b/drivers/soundwire/debugfs.c
@@ -306,12 +306,12 @@ static int cmd_go(void *data, u64 value)
 DEFINE_DEBUGFS_ATTRIBUTE(cmd_go_fops, NULL,
 			 cmd_go, "%llu\n");
 
-#define MAX_LINE_LEN 128
-
 static int read_buffer_show(struct seq_file *s_file, void *data)
 {
-	char buf[MAX_LINE_LEN];
 	int i;
+	char *buf __free(kfree) = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
 
 	if (num_bytes == 0 || num_bytes > MAX_CMD_BYTES)
 		return -EINVAL;
-- 
2.43.0