dma_async_tx_descriptor can contain a NULL variable and using it in dmaengine_submit without checking can crash the process. This patch avoids such a scenario.
Signed-off-by: Aditya Pakki <[email protected]> --- drivers/ata/sata_dwc_460ex.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c index 6f142aa54f5f..44a0d7a1ef54 100644 --- a/drivers/ata/sata_dwc_460ex.c +++ b/drivers/ata/sata_dwc_460ex.c @@ -1052,8 +1052,10 @@ static void sata_dwc_bmdma_start_by_tag(struct ata_queued_cmd *qc, u8 tag) SATA_DWC_DMACR_RXCHEN); /* Enable AHB DMA transfer on the specified channel */ - dmaengine_submit(desc); - dma_async_issue_pending(hsdevp->chan); + if (desc) { + dmaengine_submit(desc); + dma_async_issue_pending(hsdevp->chan); + } } } -- 2.17.1
