From b5b5ac32372c19b0776dceec67c9ed876b8616d3 Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 28 Mar 2003 16:54:14 +0000
Subject: [PATCH] trivial fix to make sure we have sufficient arguments before
 we mess with a possibly non-existant argv[1]  -Erik

---
 coreutils/tail.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/coreutils/tail.c b/coreutils/tail.c
index 8e0adf5b5..10b5cd7a7 100644
--- a/coreutils/tail.c
+++ b/coreutils/tail.c
@@ -118,11 +118,10 @@ int tail_main(int argc, char **argv)
 	const char *fmt;
 
 	/* Allow legacy syntax of an initial numeric option without -n. */
-	if ((argv[1][0] == '+')
-		|| ((argv[1][0] == '-')
+	if (argc >=2 && ((argv[1][0] == '+') || ((argv[1][0] == '-')
 			/* && (isdigit)(argv[1][1]) */
-			&& (((unsigned int)(argv[1][1] - '0')) <= 9))
-		) {
+			&& (((unsigned int)(argv[1][1] - '0')) <= 9)))) 
+	{
 		optind = 2;
 		optarg = argv[1];
 		goto GET_COUNT;
-- 
2.25.1