dma: Fix returned sg array (#564)

_dma_addr_sg_split() is supposed to return back sg's if the requested
dma addr spans across regions.
Also adding unit tests to cover these case.

Signed-off-by: Swapnil Ingle <swapnil.ingle@nutanix.com>
Reviewed-by: Thanos Makatos <thanos.makatos@nutanix.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/dma.c b/lib/dma.c
index 9270114..ffc0b6b 100644
--- a/lib/dma.c
+++ b/lib/dma.c
@@ -442,7 +442,7 @@ _dma_addr_sg_split(const dma_controller_t *dma,
                 size_t region_len = MIN((uint64_t)(region_end - dma_addr), len);
 
                 if (cnt < max_sg) {
-                    ret = dma_init_sg(dma, sg, dma_addr, region_len, prot, idx);
+                    ret = dma_init_sg(dma, &sg[cnt], dma_addr, region_len, prot, idx);
                     if (ret < 0) {
                         return ret;
                     }