+
Skip to content

Limit the depth of nested lists #475

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Limit the depth of nested lists #475

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 12 additions & 2 deletions src/blocks.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,14 @@
#define CODE_INDENT 4
#define TAB_STOP 4

/**
* Very deeply nested lists can cause quadratic performance issues.
* This constant is used in open_new_blocks() to limit the nesting
* depth. It is unlikely that a non-contrived markdown document will
* be nested this deeply.
*/
#define MAX_LIST_DEPTH 100

#ifndef MIN
#define MIN(x, y) ((x < y) ? x : y)
#endif
Expand Down Expand Up @@ -954,10 +962,11 @@ static void open_new_blocks(cmark_parser *parser, cmark_node **container,
bool has_content;
int save_offset;
int save_column;
size_t depth = 0;

while (cont_type != CMARK_NODE_CODE_BLOCK &&
cont_type != CMARK_NODE_HTML_BLOCK) {

depth++;
S_find_first_nonspace(parser, input);
indented = parser->indent >= CODE_INDENT;

Expand Down Expand Up @@ -1044,7 +1053,8 @@ static void open_new_blocks(cmark_parser *parser, cmark_node **container,
parser->first_nonspace + 1);
S_advance_offset(parser, input, input->len - 1 - parser->offset, false);
} else if ((!indented || cont_type == CMARK_NODE_LIST) &&
parser->indent < 4 &&
parser->indent < 4 &&
depth < MAX_LIST_DEPTH &&
(matched = parse_list_marker(
parser->mem, input, parser->first_nonspace,
(*container)->type == CMARK_NODE_PARAGRAPH, &data))) {
Expand Down
点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载