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net: fddi: fix a possible null-ptr-deref

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bp->SharedMemAddr is set to NULL while bp->SharedMemSize lesser-or-equal 0,
then memset will trigger null-ptr-deref.

fix it by replacing pci_alloc_consistent with dma_zalloc_coherent.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YueHaibing 2018-06-08 10:58:25 +08:00 committed by David S. Miller
parent 58d813afbe
commit 6310a882fb
1 changed files with 28 additions and 27 deletions
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55
drivers/net/fddi/skfp/skfddi.c
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@ -297,11 +297,11 @@ static int skfp_init_one(struct pci_dev *pdev,
return 0;
err_out5:
if (smc->os.SharedMemAddr)
pci_free_consistent(pdev, smc->os.SharedMemSize,
smc->os.SharedMemAddr,
smc->os.SharedMemDMA);
pci_free_consistent(pdev, MAX_FRAME_SIZE,
smc->os.LocalRxBuffer, smc->os.LocalRxBufferDMA);
dma_free_coherent(&pdev->dev, smc->os.SharedMemSize,
smc->os.SharedMemAddr,
smc->os.SharedMemDMA);
dma_free_coherent(&pdev->dev, MAX_FRAME_SIZE,
smc->os.LocalRxBuffer, smc->os.LocalRxBufferDMA);
err_out4:
free_netdev(dev);
err_out3:
@ -328,17 +328,17 @@ static void skfp_remove_one(struct pci_dev *pdev)
unregister_netdev(p);
if (lp->os.SharedMemAddr) {
pci_free_consistent(&lp->os.pdev,
lp->os.SharedMemSize,
lp->os.SharedMemAddr,
lp->os.SharedMemDMA);
dma_free_coherent(&pdev->dev,
lp->os.SharedMemSize,
lp->os.SharedMemAddr,
lp->os.SharedMemDMA);
lp->os.SharedMemAddr = NULL;
}
if (lp->os.LocalRxBuffer) {
pci_free_consistent(&lp->os.pdev,
MAX_FRAME_SIZE,
lp->os.LocalRxBuffer,
lp->os.LocalRxBufferDMA);
dma_free_coherent(&pdev->dev,
MAX_FRAME_SIZE,
lp->os.LocalRxBuffer,
lp->os.LocalRxBufferDMA);
lp->os.LocalRxBuffer = NULL;
}
#ifdef MEM_MAPPED_IO
@ -394,7 +394,9 @@ static int skfp_driver_init(struct net_device *dev)
spin_lock_init(&bp->DriverLock);
// Allocate invalid frame
bp->LocalRxBuffer = pci_alloc_consistent(&bp->pdev, MAX_FRAME_SIZE, &bp->LocalRxBufferDMA);
bp->LocalRxBuffer = dma_alloc_coherent(&bp->pdev.dev, MAX_FRAME_SIZE,
&bp->LocalRxBufferDMA,
GFP_ATOMIC);
if (!bp->LocalRxBuffer) {
printk("could not allocate mem for ");
printk("LocalRxBuffer: %d byte\n", MAX_FRAME_SIZE);
@ -407,23 +409,22 @@ static int skfp_driver_init(struct net_device *dev)
if (bp->SharedMemSize > 0) {
bp->SharedMemSize += 16; // for descriptor alignment
bp->SharedMemAddr = pci_alloc_consistent(&bp->pdev,
bp->SharedMemSize,
&bp->SharedMemDMA);
bp->SharedMemAddr = dma_zalloc_coherent(&bp->pdev.dev,
bp->SharedMemSize,
&bp->SharedMemDMA,
GFP_ATOMIC);
if (!bp->SharedMemAddr) {
printk("could not allocate mem for ");
printk("hardware module: %ld byte\n",
bp->SharedMemSize);
goto fail;
}
bp->SharedMemHeap = 0; // Nothing used yet.
} else {
bp->SharedMemAddr = NULL;
bp->SharedMemHeap = 0;
} // SharedMemSize > 0
}
memset(bp->SharedMemAddr, 0, bp->SharedMemSize);
bp->SharedMemHeap = 0;
card_stop(smc); // Reset adapter.
@ -442,15 +443,15 @@ static int skfp_driver_init(struct net_device *dev)
fail:
if (bp->SharedMemAddr) {
pci_free_consistent(&bp->pdev,
bp->SharedMemSize,
bp->SharedMemAddr,
bp->SharedMemDMA);
dma_free_coherent(&bp->pdev.dev,
bp->SharedMemSize,
bp->SharedMemAddr,
bp->SharedMemDMA);
bp->SharedMemAddr = NULL;
}
if (bp->LocalRxBuffer) {
pci_free_consistent(&bp->pdev, MAX_FRAME_SIZE,
bp->LocalRxBuffer, bp->LocalRxBufferDMA);
dma_free_coherent(&bp->pdev.dev, MAX_FRAME_SIZE,
bp->LocalRxBuffer, bp->LocalRxBufferDMA);
bp->LocalRxBuffer = NULL;
}
return err;