linux-kernel - [PATCH] debugfs: drop pointless nul-termination in debugfs_read_file

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Message-Id: <20210326151411.732220-1-linux@rasmusvillemoes.dk>
Date:   Fri, 26 Mar 2021 16:14:11 +0100
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] debugfs: drop pointless nul-termination in debugfs_read_file_bool()

simple_read_from_buffer() doesn't care about any bytes in the buffer
beyond "available". Making the buffer nul-terminated is therefore
completely pointless.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 fs/debugfs/file.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 686e0ad28788..9979d981e9be 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -773,7 +773,7 @@ EXPORT_SYMBOL_GPL(debugfs_create_atomic_t);
 ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
 			       size_t count, loff_t *ppos)
 {
-	char buf[3];
+	char buf[2];
 	bool val;
 	int r;
 	struct dentry *dentry = F_DENTRY(file);
@@ -789,7 +789,6 @@ ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf,
 	else
 		buf[0] = 'N';
 	buf[1] = '\n';
-	buf[2] = 0x00;
 	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
 }
 EXPORT_SYMBOL_GPL(debugfs_read_file_bool);
-- 
2.29.2