Merge pull request libgit2#5158 from pks-t/pks/patch-parsed-lifetime

patch_parse: do not depend on parsed buffer's lifetime

Author: ethomson

src/patch_parse.c

@@ -588,8 +588,8 @@ static int parse_hunk_body(
 
 		memset(line, 0x0, sizeof(git_diff_line));
 
-		line->content = ctx->parse_ctx.line + prefix;
 		line->content_len = ctx->parse_ctx.line_len - prefix;
+		line->content = git__strndup(ctx->parse_ctx.line + prefix, line->content_len);
 		line->content_offset = ctx->parse_ctx.content_len - ctx->parse_ctx.remain_len;
 		line->origin = origin;
 		line->num_lines = 1;
@@ -1038,6 +1038,8 @@ int git_patch_parsed_from_diff(git_patch **out, git_diff *d, size_t idx)
 static void patch_parsed__free(git_patch *p)
 {
 	git_patch_parsed *patch = (git_patch_parsed *)p;
+	git_diff_line *line;
+	size_t i;
 
 	if (!patch)
 		return;
@@ -1047,6 +1049,8 @@ static void patch_parsed__free(git_patch *p)
 	git__free((char *)patch->base.binary.old_file.data);
 	git__free((char *)patch->base.binary.new_file.data);
 	git_array_clear(patch->base.hunks);
+	git_array_foreach(patch->base.lines, i, line)
+		git__free((char *) line->content);
 	git_array_clear(patch->base.lines);
 	git__free(patch->base.delta);
 

tests/patch/parse.c

@@ -108,3 +108,23 @@ void test_patch_parse__files_with_whitespaces_succeeds(void)
 	cl_git_pass(git_patch_from_buffer(&patch, PATCH_NAME_WHITESPACE, strlen(PATCH_NAME_WHITESPACE), NULL));
 	git_patch_free(patch);
 }
+
+void test_patch_parse__lifetime_of_patch_does_not_depend_on_buffer(void)
+{
+	git_buf diff = GIT_BUF_INIT, rendered = GIT_BUF_INIT;
+	git_patch *patch;
+
+	cl_git_pass(git_buf_sets(&diff, PATCH_ORIGINAL_TO_CHANGE_MIDDLE));
+	cl_git_pass(git_patch_from_buffer(&patch, diff.ptr, diff.size, NULL));
+	git_buf_dispose(&diff);
+
+	cl_git_pass(git_patch_to_buf(&rendered, patch));
+	cl_assert_equal_s(PATCH_ORIGINAL_TO_CHANGE_MIDDLE, rendered.ptr);
+	git_buf_dispose(&rendered);
+
+	cl_git_pass(git_patch_to_buf(&rendered, patch));
+	cl_assert_equal_s(PATCH_ORIGINAL_TO_CHANGE_MIDDLE, rendered.ptr);
+	git_buf_dispose(&rendered);
+
+	git_patch_free(patch);
+}