linux-kernel - [PATCH 1/2] objtool: Fix seg fault caused by missing parameter

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Date:   Sat, 30 Dec 2017 14:43:31 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Simon Ser <contact@...rsion.fr>
Subject: [PATCH 1/2] objtool: Fix seg fault caused by missing parameter

From: Simon Ser <contact@...rsion.fr>

Fix a seg fault when no parameter is provided to 'objtool orc'.

Signed-off-by: Simon Ser <contact@...rsion.fr>
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 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 4c6b5c9ef073..91e8e19ff5e0 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")) {
-- 
2.13.6