linux-kernel - [PATCH] objtool: fix segfault when missing parameter

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Message-Id: <20171229224222.27159-1-contact@emersion.fr>
Date:   Fri, 29 Dec 2017 23:42:22 +0100
From:   emersion <contact@...rsion.fr>
To:     jpoimboe@...hat.com, linux-kernel@...r.kernel.org
Cc:     emersion <contact@...rsion.fr>
Subject: [PATCH] objtool: fix segfault when missing parameter

Fixes a segfault when no parameter is provided to 'objtool orc'.

Signed-off-by: Simon Ser <contact@...rsion.fr>
---
 tools/objtool/builtin-orc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c
index 4c6b5c9ef..91e8e19ff 100644
--- a/tools/objtool/builtin-orc.c
+++ b/tools/objtool/builtin-orc.c
@@ -44,6 +44,9 @@ int cmd_orc(int argc, const char **argv)
 	const char *objname;
 
 	argc--; argv++;
+	if (argc <= 0)
+		usage_with_options(orc_usage, check_options);
+
 	if (!strncmp(argv[0], "gen", 3)) {
 		argc = parse_options(argc, argv, check_options, orc_usage, 0);
 		if (argc != 1)
@@ -52,7 +55,6 @@ int cmd_orc(int argc, const char **argv)
 		objname = argv[0];
 
 		return check(objname, no_fp, no_unreachable, true);
-
 	}
 
 	if (!strcmp(argv[0], "dump")) {
-- 
2.15.1