Not all the iov elements are always valid. Signed-off-by: Fam Zheng <f...@redhat.com> --- dma-helpers.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/dma-helpers.c b/dma-helpers.c index 499b52b..3655d88 100644 --- a/dma-helpers.c +++ b/dma-helpers.c @@ -105,6 +105,9 @@ static void dma_bdrv_unmap(DMAAIOCB *dbs) int i; for (i = 0; i < dbs->iov.niov; ++i) { + if (!(dbs->iov.iov[i].iov_base && dbs->iov.iov[i].iov_len)) { + break; + } dma_memory_unmap(dbs->sg->as, dbs->iov.iov[i].iov_base, dbs->iov.iov[i].iov_len, dbs->dir, dbs->iov.iov[i].iov_len); -- 2.1.0.27.g96db324