一、Critical 级别修复（立即修复）
BUG #1: circbuffer.c 空指针解引用
问题位置：circbuffer.c:93-106
原始代码：
void cbuf_readptrs(const circbuffer *cbuf, unsigned char **p1, unsigned int *len1, unsigned char **p2, unsigned int *len2) { *p1 = &cbuf->data[cbuf->readpos]; // 未检查 data 是否为 NULL *len1 = MIN(cbuf->used, cbuf->size - cbuf->readpos); if (cbuf->used - *len1 > 0) { *p2 = cbuf->data; *len2 = cbuf->used - *len1; } else { *p2 = NULL; *len2 = 0; } }修复代码：
void cbuf_readptrs(const circbuffer *cbuf, unsigned char **p1, unsigned int *len1, unsign
