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authorNick Wellnhofer <wellnhofer@aevum.de>2015-06-07 15:11:07 +0200
committerNick Wellnhofer <wellnhofer@aevum.de>2015-06-07 21:42:15 +0200
commite2b4500209821198413fb7fb6127060034b64c87 (patch)
tree6298563e8c25ac2174c224105bb9a0e900ef3431 /src
parentb0a0cabbee704740169c9e493d61fcf786251601 (diff)
Missing bounds checks in buffer.c
Diffstat (limited to 'src')
-rw-r--r--src/buffer.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/src/buffer.c b/src/buffer.c
index bc2e38f..19ea677 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -259,7 +259,11 @@ int cmark_strbuf_cmp(const cmark_strbuf *a, const cmark_strbuf *b)
bufsize_t cmark_strbuf_strchr(const cmark_strbuf *buf, int c, bufsize_t pos)
{
- // TODO: Bounds check.
+ if (pos >= buf->size)
+ return -1;
+ if (pos < 0)
+ pos = 0;
+
const unsigned char *p = (unsigned char *)memchr(buf->ptr + pos, c, buf->size - pos);
if (!p)
return -1;
@@ -269,10 +273,12 @@ bufsize_t cmark_strbuf_strchr(const cmark_strbuf *buf, int c, bufsize_t pos)
bufsize_t cmark_strbuf_strrchr(const cmark_strbuf *buf, int c, bufsize_t pos)
{
- bufsize_t i;
+ if (pos < 0 || buf->size == 0)
+ return -1;
+ if (pos >= buf->size)
+ pos = buf->size - 1;
- // TODO: Bounds check.
- for (i = pos; i >= 0; i--) {
+ for (bufsize_t i = pos; i >= 0; i--) {
if (buf->ptr[i] == (unsigned char) c)
return i;
}
@@ -294,7 +300,8 @@ void cmark_strbuf_truncate(cmark_strbuf *buf, bufsize_t len)
void cmark_strbuf_drop(cmark_strbuf *buf, bufsize_t n)
{
if (n > 0) {
- // TODO: Bounds check.
+ if (n > buf->size)
+ n = buf->size;
buf->size = buf->size - n;
if (buf->size)
memmove(buf->ptr, buf->ptr + n, buf->size);