dmaengine: ioatdma: fix uninitialized array usage
Static analysis showed that unitialized array is being used for compare.
At line 850 when a dma_mapping_error() occurs, it jumps to dma_unmap. At
this point, dma_srcs has not been initialized. However, the code after
dma_unmap label checks dma_srcs for a comparison and thus is comparing
to random garbage in the array. Given that when dest_dma is being mapped
this is the first instance of mapping DMA memory and failed, there is
really nothing to be cleaned up and thus should jump to free_resources
label instead.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 7145f77..015f711 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -828,7 +828,7 @@
dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, dest_dma))
- goto dma_unmap;
+ goto free_resources;
for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
dma_srcs[i] = DMA_ERROR_CODE;