(main): Make sure s is not NULL before dereferencing it.

diff --git a/src/nice.c b/src/nice.c
index 814b81737dc418de515897e30c2d09e0e47750ab..a3c6bc3cf5849403b4aedd61c75bb8adec2daebb 100644 (file)
--- a/src/nice.c
+++ b/src/nice.c
@@ -91,7 +91,7 @@ main (argc, argv)
       /* Make sure s[1..] is a valid negative integer.
         Test/convert `s+1' rather than `s+2' so we reject options
         like `---5' as unrecognized.  */
-      if (s[0] == '-' && s[1] == '-' && isinteger (s + 1))
+      if (s && s[0] == '-' && s[1] == '-' && isinteger (s + 1))
        {
          adjustment = atoi (s + 1);
          adjustment_given = 1;