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a hyperfast web frontend for git written in c 

global: use proper accessors for maybe_tree

A previous commit changed ->tree to ->maybe_tree throughout, which may
have worked at the time, but wasn't safe, because maybe_tree is loaded
lazily. This manifested itself in crashes when using the "follow" log
feature. The proper fix is to use the correct contextual accessors
everytime we want access to maybe_tree. Thankfully, the commit.cocci
script takes care of creating mostly-correct patches that we could then
fix up, resulting in this commit here.

Fixes: 255b78f ("git: update to v2.18.0")
Reviewed-by: Christian Hesse <mail@eworm.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Jason A. Donenfeld Jason@zx2c4.com
Thu, 12 Mar 2020 20:52:35 -0600
commit

6a8d6d4b5021af6c90ca0da806691987df449469

parent

892ba8c3cc0617d2087a2337d8c6e71524d7b49c

7 files changed, 29 insertions(+), 19 deletions(-)

jump to
M ui-blame.c → ui-blame.c 
@@ -290,8 +290,10 @@ walk_tree_ctx.curr_rev = xstrdup(rev);
 	walk_tree_ctx.match_baselen = (path_items.match) ?
 				       basedir_len(path_items.match) : -1;
 
-	read_tree_recursive(the_repository, commit->maybe_tree, "", 0, 0,
-		&paths, walk_tree, &walk_tree_ctx);
+	read_tree_recursive(the_repository,
+			    repo_get_commit_tree(the_repository, commit),
+			    "", 0, 0,
+			    &paths, walk_tree, &walk_tree_ctx);
 	if (!walk_tree_ctx.state)
 		cgit_print_error_page(404, "Not found", "Not found");
 	else if (walk_tree_ctx.state == 2)
M ui-blob.c → ui-blob.c 
@@ -56,8 +56,9 @@ if (get_oid(ref, &oid))
 		goto done;
 	if (oid_object_info(the_repository, &oid, &size) != OBJ_COMMIT)
 		goto done;
-	read_tree_recursive(the_repository, lookup_commit_reference(the_repository, &oid)->maybe_tree,
-		"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+	read_tree_recursive(the_repository,
+			    repo_get_commit_tree(the_repository, lookup_commit_reference(the_repository, &oid)),
+			    "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 
 done:
 	free(path_items.match);

@@ -91,8 +92,10 @@ return -1;
 	type = oid_object_info(the_repository, &oid, &size);
 	if (type == OBJ_COMMIT) {
 		commit = lookup_commit_reference(the_repository, &oid);
-		read_tree_recursive(the_repository, commit->maybe_tree,
-			"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+		read_tree_recursive(the_repository,
+				    repo_get_commit_tree(the_repository, commit),
+				    "", 0, 0, &paths, walk_tree,
+				    &walk_tree_ctx);
 		if (!walk_tree_ctx.found_path)
 			return -1;
 		type = oid_object_info(the_repository, &oid, &size);

@@ -148,8 +151,10 @@ type = oid_object_info(the_repository, &oid, &size);
 
 	if ((!hex) && type == OBJ_COMMIT && path) {
 		commit = lookup_commit_reference(the_repository, &oid);
-		read_tree_recursive(the_repository, commit->maybe_tree,
-			"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+		read_tree_recursive(the_repository,
+				    repo_get_commit_tree(the_repository, commit),
+				    "", 0, 0, &paths, walk_tree,
+				    &walk_tree_ctx);
 		type = oid_object_info(the_repository, &oid, &size);
 	}
M ui-commit.c → ui-commit.c 
@@ -78,7 +78,7 @@ cgit_patch_link("patch", NULL, NULL, NULL, tmp, prefix);
 	html(")</td></tr>\n");
 	html("<tr><th>tree</th><td colspan='2' class='sha1'>");
 	tmp = xstrdup(hex);
-	cgit_tree_link(oid_to_hex(&commit->maybe_tree->object.oid), NULL, NULL,
+	cgit_tree_link(oid_to_hex(get_commit_tree_oid(commit)), NULL, NULL,
 		       ctx.qry.head, tmp, NULL);
 	if (prefix) {
 		html(" /");
M ui-diff.c → ui-diff.c 
@@ -413,7 +413,7 @@ cgit_print_error_page(404, "Not found",
 			"Bad commit: %s", oid_to_hex(new_rev_oid));
 		return;
 	}
-	new_tree_oid = &commit->maybe_tree->object.oid;
+	new_tree_oid = get_commit_tree_oid(commit);
 
 	if (old_rev) {
 		if (get_oid(old_rev, old_rev_oid)) {

@@ -434,7 +434,7 @@ cgit_print_error_page(404, "Not found",
 				"Bad commit: %s", oid_to_hex(old_rev_oid));
 			return;
 		}
-		old_tree_oid = &commit2->maybe_tree->object.oid;
+		old_tree_oid = get_commit_tree_oid(commit2);
 	} else {
 		old_tree_oid = NULL;
 	}
M ui-log.c → ui-log.c 
@@ -153,8 +153,8 @@ add_lines = 0;
 	rem_lines = 0;
 
 	revs->diffopt.flags.recursive = 1;
-	diff_tree_oid(&parent->maybe_tree->object.oid,
-		      &commit->maybe_tree->object.oid,
+	diff_tree_oid(get_commit_tree_oid(parent),
+		      get_commit_tree_oid(commit),
 		      "", &revs->diffopt);
 	diffcore_std(&revs->diffopt);
M ui-plain.c → ui-plain.c 
@@ -193,13 +193,14 @@ }
 	if (!path_items.match) {
 		path_items.match = "";
 		walk_tree_ctx.match_baselen = -1;
-		print_dir(&commit->maybe_tree->object.oid, "", 0, "");
+		print_dir(get_commit_tree_oid(commit), "", 0, "");
 		walk_tree_ctx.match = 2;
 	}
 	else
 		walk_tree_ctx.match_baselen = basedir_len(path_items.match);
-	read_tree_recursive(the_repository, commit->maybe_tree,
-		"", 0, 0, &paths, walk_tree, &walk_tree_ctx);
+	read_tree_recursive(the_repository,
+		            repo_get_commit_tree(the_repository, commit),
+		            "", 0, 0, &paths, walk_tree, &walk_tree_ctx);
 	if (!walk_tree_ctx.match)
 		cgit_print_error_page(404, "Not found", "Not found");
 	else if (walk_tree_ctx.match == 2)
M ui-tree.c → ui-tree.c 
@@ -370,12 +370,14 @@
 	walk_tree_ctx.curr_rev = xstrdup(rev);
 
 	if (path == NULL) {
-		ls_tree(&commit->maybe_tree->object.oid, NULL, &walk_tree_ctx);
+		ls_tree(get_commit_tree_oid(commit), NULL, &walk_tree_ctx);
 		goto cleanup;
 	}
 
-	read_tree_recursive(the_repository, commit->maybe_tree, "", 0, 0,
-		&paths, walk_tree, &walk_tree_ctx);
+	read_tree_recursive(the_repository,
+			    repo_get_commit_tree(the_repository, commit),
+			    "", 0, 0,
+			    &paths, walk_tree, &walk_tree_ctx);
 	if (walk_tree_ctx.state == 1)
 		ls_tail();
 	else if (walk_tree_ctx.state == 2)