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@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20210326151411.732220-1-linux@rasmusvillemoes.dk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 686e0ad..9979d98 100644 (file)
--- 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);