linux-kernel - Re: [PATCH] firewire: nosy: do not ignore errors in ioremap

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Date:   Sun, 9 Oct 2016 11:51:05 +0200
From:   Stefan Richter <stefanr@...6.in-berlin.de>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:     linux1394-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: Re: [PATCH] firewire: nosy: do not ignore errors in
 ioremap_nocache()

On Sep 25 Alexey Khoroshilov wrote:
> There is no check if ioremap_nocache() returns a valid pointer.
> Potentially it can lead to null pointer dereference.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
>  drivers/firewire/nosy.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
> index 631c977b0da5..f68a749f740b 100644
> --- a/drivers/firewire/nosy.c
> +++ b/drivers/firewire/nosy.c
> @@ -566,6 +566,11 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused)
>  
>  	lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
>  					  PCILYNX_MAX_REGISTER);
> +	if (lynx->registers == NULL) {
> +		dev_err(&dev->dev, "Failed to map registers\n");
> +		ret = -ENOMEM;
> +		goto fail_deallocate2;
> +	}
>  
>  	lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
>  				sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
> @@ -679,6 +684,8 @@ fail_deallocate:
>  		pci_free_consistent(lynx->pci_device, PAGE_SIZE,
>  				lynx->rcv_buffer, lynx->rcv_buffer_bus);
>  	iounmap(lynx->registers);
> +
> +fail_deallocate2:
>  	kfree(lynx);
>  
>  fail_disable:

Thanks.  Committed to linux1394.git.
I folded the following cosmetic change into the commit:

--- a/drivers/firewire/nosy.c
+++ b/drivers/firewire/nosy.c
@@ -569,7 +569,7 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 	if (lynx->registers == NULL) {
 		dev_err(&dev->dev, "Failed to map registers\n");
 		ret = -ENOMEM;
-		goto fail_deallocate2;
+		goto fail_deallocate_lynx;
 	}
 
 	lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
@@ -583,7 +583,7 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 	    lynx->rcv_buffer == NULL) {
 		dev_err(&dev->dev, "Failed to allocate receive buffer\n");
 		ret = -ENOMEM;
-		goto fail_deallocate;
+		goto fail_deallocate_buffers;
 	}
 	lynx->rcv_start_pcl->next	= cpu_to_le32(lynx->rcv_pcl_bus);
 	lynx->rcv_pcl->next		= cpu_to_le32(PCL_NEXT_INVALID);
@@ -646,7 +646,7 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused)
 		dev_err(&dev->dev,
 			"Failed to allocate shared interrupt %d\n", dev->irq);
 		ret = -EIO;
-		goto fail_deallocate;
+		goto fail_deallocate_buffers;
 	}
 
 	lynx->misc.parent = &dev->dev;
@@ -673,7 +673,7 @@ fail_free_irq:
 	reg_write(lynx, PCI_INT_ENABLE, 0);
 	free_irq(lynx->pci_device->irq, lynx);
 
-fail_deallocate:
+fail_deallocate_buffers:
 	if (lynx->rcv_start_pcl)
 		pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
 				lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
@@ -685,7 +685,7 @@ fail_deallocate:
 				lynx->rcv_buffer, lynx->rcv_buffer_bus);
 	iounmap(lynx->registers);
 
-fail_deallocate2:
+fail_deallocate_lynx:
 	kfree(lynx);
 
 fail_disable:

-- 
Stefan Richter
-======----- =-=- -=--=
http://arcgraph.de/sr/