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vmxnet3: fix checks for dma mapping errors
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vmxnet3_drv does not check dma_addr with dma_mapping_error()
after mapping dma memory. The patch adds the checks and
tries to handle failures.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <[email protected]>
Acked-by: Shrikrishna Khare <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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@khoroshilov @davem330
khoroshilov authored and davem330 committed Dec 1, 2015
1 parent ee9159d commit 5738a09
Showing 1 changed file with 60 additions and 11 deletions.
71 changes: 60 additions & 11 deletions drivers/net/vmxnet3/vmxnet3_drv.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -587,6 +587,12 @@ vmxnet3_rq_alloc_rx_buf(struct vmxnet3_rx_queue *rq, u32 ring_idx,
&adapter->pdev->dev,
rbi->skb->data, rbi->len,
PCI_DMA_FROMDEVICE);
if (dma_mapping_error(&adapter->pdev->dev,
rbi->dma_addr)) {
dev_kfree_skb_any(rbi->skb);
rq->stats.rx_buf_alloc_failure++;
break;
}
} else {
/* rx buffer skipped by the device */
}
Expand All @@ -605,13 +611,18 @@ vmxnet3_rq_alloc_rx_buf(struct vmxnet3_rx_queue *rq, u32 ring_idx,
&adapter->pdev->dev,
rbi->page, 0, PAGE_SIZE,
PCI_DMA_FROMDEVICE);
if (dma_mapping_error(&adapter->pdev->dev,
rbi->dma_addr)) {
put_page(rbi->page);
rq->stats.rx_buf_alloc_failure++;
break;
}
} else {
/* rx buffers skipped by the device */
}
val = VMXNET3_RXD_BTYPE_BODY << VMXNET3_RXD_BTYPE_SHIFT;
}

BUG_ON(rbi->dma_addr == 0);
gd->rxd.addr = cpu_to_le64(rbi->dma_addr);
gd->dword[2] = cpu_to_le32((!ring->gen << VMXNET3_RXD_GEN_SHIFT)
| val | rbi->len);
Expand Down Expand Up @@ -655,7 +666,7 @@ vmxnet3_append_frag(struct sk_buff *skb, struct Vmxnet3_RxCompDesc *rcd,
}


static void
static int
vmxnet3_map_pkt(struct sk_buff *skb, struct vmxnet3_tx_ctx *ctx,
struct vmxnet3_tx_queue *tq, struct pci_dev *pdev,
struct vmxnet3_adapter *adapter)
Expand Down Expand Up @@ -715,6 +726,8 @@ vmxnet3_map_pkt(struct sk_buff *skb, struct vmxnet3_tx_ctx *ctx,
tbi->dma_addr = dma_map_single(&adapter->pdev->dev,
skb->data + buf_offset, buf_size,
PCI_DMA_TODEVICE);
if (dma_mapping_error(&adapter->pdev->dev, tbi->dma_addr))
return -EFAULT;

tbi->len = buf_size;

Expand Down Expand Up @@ -755,6 +768,8 @@ vmxnet3_map_pkt(struct sk_buff *skb, struct vmxnet3_tx_ctx *ctx,
tbi->dma_addr = skb_frag_dma_map(&adapter->pdev->dev, frag,
buf_offset, buf_size,
DMA_TO_DEVICE);
if (dma_mapping_error(&adapter->pdev->dev, tbi->dma_addr))
return -EFAULT;

tbi->len = buf_size;

Expand Down Expand Up @@ -782,6 +797,8 @@ vmxnet3_map_pkt(struct sk_buff *skb, struct vmxnet3_tx_ctx *ctx,
/* set the last buf_info for the pkt */
tbi->skb = skb;
tbi->sop_idx = ctx->sop_txd - tq->tx_ring.base;

return 0;
}


Expand Down Expand Up @@ -1020,7 +1037,8 @@ vmxnet3_tq_xmit(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
}

/* fill tx descs related to addr & len */
vmxnet3_map_pkt(skb, &ctx, tq, adapter->pdev, adapter);
if (vmxnet3_map_pkt(skb, &ctx, tq, adapter->pdev, adapter))
goto unlock_drop_pkt;

/* setup the EOP desc */
ctx.eop_txd->dword[3] = cpu_to_le32(VMXNET3_TXD_CQ | VMXNET3_TXD_EOP);
Expand Down Expand Up @@ -1231,6 +1249,7 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
struct vmxnet3_rx_buf_info *rbi;
struct sk_buff *skb, *new_skb = NULL;
struct page *new_page = NULL;
dma_addr_t new_dma_addr;
int num_to_alloc;
struct Vmxnet3_RxDesc *rxd;
u32 idx, ring_idx;
Expand Down Expand Up @@ -1287,6 +1306,21 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
skip_page_frags = true;
goto rcd_done;
}
new_dma_addr = dma_map_single(&adapter->pdev->dev,
new_skb->data, rbi->len,
PCI_DMA_FROMDEVICE);
if (dma_mapping_error(&adapter->pdev->dev,
new_dma_addr)) {
dev_kfree_skb(new_skb);
/* Skb allocation failed, do not handover this
* skb to stack. Reuse it. Drop the existing pkt
*/
rq->stats.rx_buf_alloc_failure++;
ctx->skb = NULL;
rq->stats.drop_total++;
skip_page_frags = true;
goto rcd_done;
}

dma_unmap_single(&adapter->pdev->dev, rbi->dma_addr,
rbi->len,
Expand All @@ -1303,9 +1337,7 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,

/* Immediate refill */
rbi->skb = new_skb;
rbi->dma_addr = dma_map_single(&adapter->pdev->dev,
rbi->skb->data, rbi->len,
PCI_DMA_FROMDEVICE);
rbi->dma_addr = new_dma_addr;
rxd->addr = cpu_to_le64(rbi->dma_addr);
rxd->len = rbi->len;
if (adapter->version == 2 &&
Expand Down Expand Up @@ -1348,6 +1380,19 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
skip_page_frags = true;
goto rcd_done;
}
new_dma_addr = dma_map_page(&adapter->pdev->dev
, rbi->page,
0, PAGE_SIZE,
PCI_DMA_FROMDEVICE);
if (dma_mapping_error(&adapter->pdev->dev,
new_dma_addr)) {
put_page(new_page);
rq->stats.rx_buf_alloc_failure++;
dev_kfree_skb(ctx->skb);
ctx->skb = NULL;
skip_page_frags = true;
goto rcd_done;
}

dma_unmap_page(&adapter->pdev->dev,
rbi->dma_addr, rbi->len,
Expand All @@ -1357,10 +1402,7 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,

/* Immediate refill */
rbi->page = new_page;
rbi->dma_addr = dma_map_page(&adapter->pdev->dev
, rbi->page,
0, PAGE_SIZE,
PCI_DMA_FROMDEVICE);
rbi->dma_addr = new_dma_addr;
rxd->addr = cpu_to_le64(rbi->dma_addr);
rxd->len = rbi->len;
}
Expand Down Expand Up @@ -2167,7 +2209,8 @@ vmxnet3_set_mc(struct net_device *netdev)
PCI_DMA_TODEVICE);
}

if (new_table_pa) {
if (!dma_mapping_error(&adapter->pdev->dev,
new_table_pa)) {
new_mode |= VMXNET3_RXM_MCAST;
rxConf->mfTablePA = cpu_to_le64(new_table_pa);
} else {
Expand Down Expand Up @@ -3075,6 +3118,11 @@ vmxnet3_probe_device(struct pci_dev *pdev,
adapter->adapter_pa = dma_map_single(&adapter->pdev->dev, adapter,
sizeof(struct vmxnet3_adapter),
PCI_DMA_TODEVICE);
if (dma_mapping_error(&adapter->pdev->dev, adapter->adapter_pa)) {
dev_err(&pdev->dev, "Failed to map dma\n");
err = -EFAULT;
goto err_dma_map;
}
adapter->shared = dma_alloc_coherent(
&adapter->pdev->dev,
sizeof(struct Vmxnet3_DriverShared),
Expand Down Expand Up @@ -3233,6 +3281,7 @@ vmxnet3_probe_device(struct pci_dev *pdev,
err_alloc_shared:
dma_unmap_single(&adapter->pdev->dev, adapter->adapter_pa,
sizeof(struct vmxnet3_adapter), PCI_DMA_TODEVICE);
err_dma_map:
free_netdev(netdev);
return err;
}
Expand Down

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