blame: prevent a segv when -L given start > EOF

blame would segv if given -L <lineno> with <lineno> past the end of the file.
While we're fixing the bug, add test cases for an invalid <start> when called
as -L <start>,<end> or -L<start>.

Signed-off-by: Jay Soffian <jaysoffian@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin-blame.c b/builtin-blame.c
index 98e818c..4094f3c 100644 (file)
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -2432,7 +2432,7 @@ parse_done:
        if (top < 1)
                top = lno;
        bottom--;
-       if (lno < top)
+       if (lno < top || lno < bottom)
                die("file %s has only %lu lines", path, lno);
 
        ent = xcalloc(1, sizeof(*ent));

diff --git a/t/t8003-blame.sh b/t/t8003-blame.sh
index ad834f2..4a8db74 100755 (executable)
--- a/t/t8003-blame.sh
+++ b/t/t8003-blame.sh
@@ -157,4 +157,12 @@ EOF
   git --no-pager blame $COMMIT -- uno >/dev/null
 '
 
+test_expect_success 'blame -L with invalid start' '
+       test_must_fail git blame -L5 tres 2>&1 | grep "has only 2 lines"
+'
+
+test_expect_success 'blame -L with invalid end' '
+       git blame -L1,5 tres 2>&1 | grep "has only 2 lines"
+'
+
 test_done