[PATCH v5 15/15] dmaengine: dw-edma: Add pcim_iomap_table return check

Gustavo Pimentel
2021-02-11T09:18:17Z

Detected by CoverityScan CID 16555 ("Dereference null return")

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
---
drivers/dma/dw-edma/dw-edma-pcie.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
index 686b4ff..7445033 100644
--- a/drivers/dma/dw-edma/dw-edma-pcie.c
+++ b/drivers/dma/dw-edma/dw-edma-pcie.c
@@ -238,6 +238,9 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
dw->rd_ch_cnt = vsec_data.rd_ch_cnt;

dw->rg_region.vaddr = pcim_iomap_table(pdev)[vsec_data.rg.bar];
+ if (!dw->rg_region.vaddr)
+ return -ENOMEM;
+
dw->rg_region.vaddr += vsec_data.rg.off;
dw->rg_region.paddr = pdev->resource[vsec_data.rg.bar].start;
dw->rg_region.paddr += vsec_data.rg.off;
@@ -250,12 +253,18 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
struct dw_edma_block *dt_block = &vsec_data.dt_wr[i];

ll_region->vaddr = pcim_iomap_table(pdev)[ll_block->bar];
+ if (!ll_region->vaddr)
+ return -ENOMEM;
+
ll_region->vaddr += ll_block->off;
ll_region->paddr = pdev->resource[ll_block->bar].start;
ll_region->paddr += ll_block->off;
ll_region->sz = ll_block->sz;

dt_region->vaddr = pcim_iomap_table(pdev)[dt_block->bar];
+ if (!dt_region->vaddr)
+ return -ENOMEM;
+
dt_region->vaddr += dt_block->off;
dt_region->paddr = pdev->resource[dt_block->bar].start;
dt_region->paddr += dt_block->off;
@@ -269,12 +278,18 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
struct dw_edma_block *dt_block = &vsec_data.dt_rd[i];

ll_region->vaddr = pcim_iomap_table(pdev)[ll_block->bar];
+ if (!ll_region->vaddr)
+ return -ENOMEM;
+
ll_region->vaddr += ll_block->off;
ll_region->paddr = pdev->resource[ll_block->bar].start;
ll_region->paddr += ll_block->off;
ll_region->sz = ll_block->sz;

dt_region->vaddr = pcim_iomap_table(pdev)[dt_block->bar];
+ if (!dt_region->vaddr)
+ return -ENOMEM;
+
dt_region->vaddr += dt_block->off;
dt_region->paddr = pdev->resource[dt_block->bar].start;
dt_region->paddr += dt_block->off;
--
2.7.4