Currently there is no measure in place to prevent the blob buffer
to exceed its maximum allowed length of 16MB. Continuously
calling blob_add() will expand the buffer until it exceeds
BLOB_ATTR_LEN_MASK and after that will return valid blob_attr
pointer without increasing the buflen.
A test program was added in the previous commit, this one fixes
the issue by asserting that the new bufflen after grow does not
exceed BLOB_ATTR_LEN_MASK.
Signed-off-by: Zefir Kurtisi <zefir.kurtisi@gmail.com>
{
int offset_head = attr_to_offset(buf, buf->head);
+ if ((buf->buflen + required) > BLOB_ATTR_LEN_MASK)
+ return false;
if (!buf->grow || !buf->grow(buf, required))
return false;