objtool: Fix seg fault caused by missing parameter

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

Signed-off-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/9172803ec7ebb72535bcd0b7f966ae96d515968e.1514666459.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 3 insertions, 1 deletions

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")) {