linux-kernel - [PATCH v2 2/3] module: avoid *goto*s in module_sig

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Date:   Sat, 31 Oct 2020 23:09:31 +0300
From:   Sergey Shtylyov <s.shtylyov@...russia.ru>
To:     Jessica Yu <jeyu@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Joe Perches <joe@...ches.com>
Subject: [PATCH v2 2/3] module: avoid *goto*s in module_sig_check()

Let's move the common handling of the non-fatal errors after the *switch*
statement -- this avoids *goto*s inside that *switch*...

Suggested-by: Joe Perches <joe@...ches.com>
Signed-off-by: Sergey Shtylyov <s.shtylyov@...russia.ru>

---
Changes in version 2:
- new patch.

 kernel/module.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

Index: linux/kernel/module.c
===================================================================
--- linux.orig/kernel/module.c
+++ linux/kernel/module.c
@@ -2908,20 +2908,13 @@ static int module_sig_check(struct load_
 		 */
 	case -ENODATA:
 		reason = "unsigned module";
-		goto decide;
+		break;
 	case -ENOPKG:
 		reason = "module with unsupported crypto";
-		goto decide;
+		break;
 	case -ENOKEY:
 		reason = "module with unavailable key";
-	decide:
-		if (is_module_sig_enforced()) {
-			pr_notice("%s: loading of %s is rejected\n",
-				  info->name, reason);
-			return -EKEYREJECTED;
-		}
-
-		return security_locked_down(LOCKDOWN_MODULE_SIGNATURE);
+		break;
 
 		/* All other errors are fatal, including nomem, unparseable
 		 * signatures and signature check failures - even if signatures
@@ -2930,6 +2923,13 @@ static int module_sig_check(struct load_
 	default:
 		return err;
 	}
+
+	if (is_module_sig_enforced()) {
+		pr_notice("%s: loading of %s is rejected\n", info->name, reason);
+		return -EKEYREJECTED;
+	}
+
+	return security_locked_down(LOCKDOWN_MODULE_SIGNATURE);
 }
 #else /* !CONFIG_MODULE_SIG */
 static int module_sig_check(struct load_info *info, int flags)