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Subject[PATCH] ata: dwc_460ex: Avoid potential NULL pointer dereference
Date
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 <pakki001@umn.edu>
---
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
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