vbf_stp_fetchbody(struct worker *wrk, struct busyobj *bo)
{
	ssize_t l;
	uint8_t *ptr;
	enum vfp_status vfps = VFP_ERROR;
	ssize_t est;
	struct vfp_ctx *vfc;

	CHECK_OBJ_NOTNULL(bo, BUSYOBJ_MAGIC);
	vfc = bo->vfc;
	CHECK_OBJ_NOTNULL(vfc, VFP_CTX_MAGIC);

	AN(vfc->vfp_nxt);

	est = bo->htc->content_length;
	if (est < 0)
		est = 0;

	do {
		if (vfc->oc->flags & OC_F_ABANDON) {
			/*
			 * A pass object and delivery was terminated
			 * We don't fail the fetch, in order for hit-for-pass
			 * objects to be created.
			 */
			AN(vfc->oc->flags & OC_F_PASS);
			VSLb(wrk->vsl, SLT_FetchError,
			    "Pass delivery abandoned");
			bo->htc->doclose = SC_RX_BODY;
			break;
		}
		AZ(vfc->failed);
		l = est;
		assert(l >= 0);
		if (VFP_GetStorage(vfc, &l, &ptr) != VFP_OK) {
			bo->htc->doclose = SC_RX_BODY;
			break;
		}

		AZ(vfc->failed);
		vfps = VFP_Suck(vfc, ptr, &l);
		if (l > 0 && vfps != VFP_ERROR) {
			bo->acct.beresp_bodybytes += l;
			VFP_Extend(vfc, l);
			if (est >= l)
				est -= l;
			else
				est = 0;
		}
	} while (vfps == VFP_OK);

	if (vfc->failed) {
		(void)VFP_Error(vfc, "Fetch pipeline failed to process");
		bo->htc->doclose = SC_RX_BODY;
		VFP_Close(vfc);
		VDI_Finish(wrk, bo);
		if (!bo->do_stream) {
			assert(bo->fetch_objcore->boc->state < BOS_STREAM);
			return (F_STP_ERROR);
		} else {
			wrk->stats->fetch_failed++;
			return (F_STP_FAIL);
		}
	}

	ObjTrimStore(wrk, vfc->oc);
	return (F_STP_FETCHEND);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.