The vulnerability description explicitly identifies draw_block_rectangle in libavfilter/vf_codecview.c as the vulnerable function. The commit information obtained via get_commit_infos for the provided commit URL (https://github.com/FFmpeg/FFmpeg/commit/99debe5) shows a patch applied to this exact function. The patch removes a for loop that iterates from sx to sx + w, writing to buf[x]. This loop is the source of the heap buffer overflow, as an attacker-controlled input could make sx + w exceed the bounds of the buf buffer. The fetch_url_content tool confirmed the commit URL from the advisory. The previous turn's output already contained this information, which is being reused here as it is accurate and complete based on the available data and tools used (fetch_url_content and get_commit_infos).