Fixed buffer overflow error in S_parser_feed.

The overflow could occur in the following condition:
the buffer ends with `\r` and the next memory address
contains `\n`.

Closes #184.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/blocks.c b/src/blocks.c
index 99dd082..051d2e8 100644
--- a/src/blocks.c
+++ b/src/blocks.c
@@ -580,7 +580,7 @@ static void S_parser_feed(cmark_parser *parser, const unsigned char *buffer,
           if (buffer == end)
             parser->last_buffer_ended_with_cr = true;
         }
-        if (*buffer == '\n')
+        if (buffer < end && *buffer == '\n')
           buffer++;
       }
     }