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 (file)
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -828,7 +828,7 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
 
        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;