From 3e0fa0695e26d1d77af8ebc8d70ed8817303a0b3 Mon Sep 17 00:00:00 2001 From: John MacFarlane Date: Wed, 16 Sep 2015 09:03:40 -0700 Subject: Check for NULL pointer in _scan_at. Closes #81. --- src/scanners.re | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'src/scanners.re') diff --git a/src/scanners.re b/src/scanners.re index 0037bc4..75417a1 100644 --- a/src/scanners.re +++ b/src/scanners.re @@ -6,11 +6,17 @@ bufsize_t _scan_at(bufsize_t (*scanner)(const unsigned char *), cmark_chunk *c, { bufsize_t res; unsigned char *ptr = (unsigned char *)c->data; - unsigned char lim = ptr[c->len]; + unsigned char zero = '\0'; - ptr[c->len] = '\0'; - res = scanner(ptr + offset); - ptr[c->len] = lim; + if (ptr == NULL) { + res = scanner(&zero); + } else { + unsigned char lim = ptr[c->len]; + + ptr[c->len] = '\0'; + res = scanner(ptr + offset); + ptr[c->len] = lim; + } return res; } -- cgit v1.2.3