linux-kernel - [PATCH] lkdtm: no need to check return value of debugfs

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Date:   Tue, 11 Jun 2019 20:32:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] lkdtm: no need to check return value of debugfs_create
 functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Kees Cook <keescook@...omium.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/lkdtm/core.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/misc/lkdtm/core.c b/drivers/misc/lkdtm/core.c
index 1972dad966f5..bae3b3763f3e 100644
--- a/drivers/misc/lkdtm/core.c
+++ b/drivers/misc/lkdtm/core.c
@@ -429,22 +429,13 @@ static int __init lkdtm_module_init(void)
 
 	/* Register debugfs interface */
 	lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL);
-	if (!lkdtm_debugfs_root) {
-		pr_err("creating root dir failed\n");
-		return -ENODEV;
-	}
 
 	/* Install debugfs trigger files. */
 	for (i = 0; i < ARRAY_SIZE(crashpoints); i++) {
 		struct crashpoint *cur = &crashpoints[i];
-		struct dentry *de;
 
-		de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root,
-					 cur, &cur->fops);
-		if (de == NULL) {
-			pr_err("could not create crashpoint %s\n", cur->name);
-			goto out_err;
-		}
+		debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, cur,
+				    &cur->fops);
 	}
 
 	/* Install crashpoint if one was selected. */
-- 
2.22.0