Merge branch 'jm/maint-apply-detects-corrupt-patch-header' into maint

* jm/maint-apply-detects-corrupt-patch-header:
  fix "git apply --index ..." not to deref NULL

diff --git a/builtin/apply.c b/builtin/apply.c
index f2edc52818e817e83717f992a6bbd66dad4ef24d..aaa39fe17e9c4c2d6ea027063b0a825a3918ebc7 100644 (file)
--- a/builtin/apply.c
+++ b/builtin/apply.c
@@ -1407,6 +1407,9 @@ static int find_header(char *line, unsigned long size, int *hdrsize, struct patc
                                            "%d leading pathname components (line %d)" , p_value, linenr);
                                patch->old_name = patch->new_name = patch->def_name;
                        }
+                       if (!patch->is_delete && !patch->new_name)
+                               die("git diff header lacks filename information "
+                                   "(line %d)", linenr);
                        patch->is_toplevel_relative = 1;
                        *hdrsize = git_hdr_len;
                        return offset;

diff --git a/t/t4254-am-corrupt.sh b/t/t4254-am-corrupt.sh
new file mode 100755 (executable)
index 0000000..b7da95f
--- /dev/null
+++ b/t/t4254-am-corrupt.sh
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+test_description='git am with corrupt input'
+. ./test-lib.sh
+
+# Note the missing "+++" line:
+cat > bad-patch.diff <<'EOF'
+From: A U Thor <au.thor@example.com>
+diff --git a/f b/f
+index 7898192..6178079 100644
+--- a/f
+@@ -1 +1 @@
+-a
++b
+EOF
+
+test_expect_success setup '
+       test $? = 0 &&
+       echo a > f &&
+       git add f &&
+       test_tick &&
+       git commit -m initial
+'
+
+# This used to fail before, too, but with a different diagnostic.
+#   fatal: unable to write file '(null)' mode 100644: Bad address
+# Also, it had the unwanted side-effect of deleting f.
+test_expect_success 'try to apply corrupted patch' '
+       git am bad-patch.diff 2> actual
+       test $? = 1
+'
+
+cat > expected <<EOF
+fatal: git diff header lacks filename information (line 4)
+EOF
+
+test_expect_success 'compare diagnostic; ensure file is still here' '
+       test $? = 0 &&
+       test -f f &&
+       test_cmp expected actual
+'
+
+test_done