linux-kernel - [PATCH] ASN.1: Fix NULL check after strdup call

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Date:   Tue, 27 Aug 2019 19:06:12 +0300
From:   Denis Efremov <efremov@...ux.com>
To:     linux-kernel@...r.kernel.org
Cc:     Denis Efremov <efremov@...ux.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Leonardo Bras <leobras.c@...il.com>,
        Allison Randal <allison@...utok.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH] ASN.1: Fix NULL check after strdup call

strdup function returns a pointer to the newly allocated string,
or a NULL if an error occurred. Thus, grammar_name should be checked
right after strdup call. p variable can't be NULL in this context.
This follows from p check before the strdup call.

Signed-off-by: Denis Efremov <efremov@...ux.com>
---
 scripts/asn1_compiler.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/asn1_compiler.c b/scripts/asn1_compiler.c
index adabd4145264..985fb81cae79 100644
--- a/scripts/asn1_compiler.c
+++ b/scripts/asn1_compiler.c
@@ -625,7 +625,7 @@ int main(int argc, char **argv)
 	p = strrchr(argv[1], '/');
 	p = p ? p + 1 : argv[1];
 	grammar_name = strdup(p);
-	if (!p) {
+	if (!grammar_name) {
 		perror(NULL);
 		exit(1);
 	}
-- 
2.21.0