patch parse: dup the patch from the callers

src/patch.c

@@ -196,12 +196,6 @@ int git_patch_get_line_in_hunk(
 
 static void git_patch__free(git_patch *patch)
 {
-	git_array_clear(patch->lines);
-	git_array_clear(patch->hunks);
-
-	git__free((char *)patch->binary.old_file.data);
-	git__free((char *)patch->binary.new_file.data);
-
 	if (patch->free_fn)
 		patch->free_fn(patch);
 }

src/patch_diff.c

@@ -25,6 +25,12 @@ static void patch_diff_free(git_patch *p)
 {
 	git_patch_diff *patch = (git_patch_diff *)p;
 
+    git_array_clear(patch->base.lines);
+	git_array_clear(patch->base.hunks);
+
+	git__free((char *)patch->base.binary.old_file.data);
+	git__free((char *)patch->base.binary.new_file.data);
+
 	git_diff_file_content__clear(&patch->ofile);
 	git_diff_file_content__clear(&patch->nfile);
 

src/patch_parse.c

@@ -10,6 +10,10 @@ typedef struct {
 
 	git_patch_options opts;
 
+	/* the patch contents, which lines will point into. */
+	/* TODO: allow us to point somewhere refcounted. */
+	char *content;
+
 	/* the paths from the `diff --git` header, these will be used if this is not
 	 * a rename (and rename paths are specified) or if no `+++`/`---` line specify
 	 * the paths.
@@ -931,6 +935,12 @@ static void patch_parsed__free(git_patch *p)
 	if (!patch)
 		return;
 
+	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_clear(patch->base.lines);
+	git__free(patch->base.delta);
+
 	git__free(patch->old_prefix);
 	git__free(patch->new_prefix);
 	git__free(patch->header_old_path);
@@ -939,9 +949,7 @@ static void patch_parsed__free(git_patch *p)
 	git__free(patch->rename_new_path);
 	git__free(patch->old_path);
 	git__free(patch->new_path);
-	git_array_clear(patch->base.hunks);
-	git_array_clear(patch->base.lines);
-	git__free(patch->base.delta);
+	git__free(patch->content);
 	git__free(patch);
 }
 
@@ -969,10 +977,19 @@ int git_patch_from_patchfile(
 	patch->base.free_fn = patch_parsed__free;
 
 	patch->base.delta = git__calloc(1, sizeof(git_diff_delta));
+	GITERR_CHECK_ALLOC(patch->base.delta);
+
 	patch->base.delta->status = GIT_DELTA_MODIFIED;
 	patch->base.delta->nfiles = 2;
 
-	ctx.content = content;
+	if (content_len) {
+		patch->content = git__malloc(content_len);
+		GITERR_CHECK_ALLOC(patch->content);
+
+		memcpy(patch->content, content, content_len);
+	}
+
+	ctx.content = patch->content;
 	ctx.content_len = content_len;
 	ctx.remain = content_len;