shuf: fix a segfault on 'shuf -e'

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/coreutils/shuf.c b/coreutils/shuf.c
index f213d675923bb7a603340a5df6e14eb8de2bb6b8..648a4abbb39337b4377cca6c190919176a73ab11 100644 (file)
--- a/coreutils/shuf.c
+++ b/coreutils/shuf.c
@@ -126,7 +126,8 @@ int shuf_main(int argc, char **argv)
                fclose_if_not_stdin(fp);
        }
 
-       shuffle_lines(lines, numlines);
+       if (numlines != 0)
+               shuffle_lines(lines, numlines);
 
        if (opts & OPT_o)
                xmove_fd(xopen(opt_o_str, O_WRONLY|O_CREAT|O_TRUNC), STDOUT_FILENO);