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Groups > linux.kernel > #1634126 > unrolled thread
| Started by | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| First post | 2017-05-02 06:10 +0200 |
| Last post | 2017-05-02 20:50 +0200 |
| Articles | 5 — 2 participants |
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[PATCH] usb: gadget: udc: add null check before pointer dereference "Gustavo A. R. Silva" <garsilva@embeddedor.com> - 2017-05-02 06:10 +0200
Re: [PATCH] usb: gadget: udc: add null check before pointer dereference Alan Stern <stern@rowland.harvard.edu> - 2017-05-02 16:40 +0200
Re: [PATCH] usb: gadget: udc: add null check before pointer dereference "Gustavo A. R. Silva" <garsilva@embeddedor.com> - 2017-05-02 18:00 +0200
[PATCH v2] usb: gadget: udc: add null check before pointer dereference "Gustavo A. R. Silva" <garsilva@embeddedor.com> - 2017-05-02 19:10 +0200
Re: [PATCH v2] usb: gadget: udc: add null check before pointer dereference Alan Stern <stern@rowland.harvard.edu> - 2017-05-02 20:50 +0200
| From | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| Date | 2017-05-02 06:10 +0200 |
| Subject | [PATCH] usb: gadget: udc: add null check before pointer dereference |
| Message-ID | <tCxip-1nj-13@gated-at.bofh.it> |
Add null check before dereferencing dev->regs pointer inside
net2280_led_shutdown() function.
Addresses-Coverity-ID: 101783
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
drivers/usb/gadget/udc/net2280.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index 3828c2e..1898a4b 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -3573,7 +3573,11 @@ static void net2280_remove(struct pci_dev *pdev)
BUG_ON(dev->driver);
/* then clean up the resources we allocated during probe() */
- net2280_led_shutdown(dev);
+
+ if (dev->regs) {
+ net2280_led_shutdown(dev);
+ iounmap(dev->regs);
+ }
if (dev->requests) {
int i;
for (i = 1; i < 5; i++) {
@@ -3588,8 +3592,6 @@ static void net2280_remove(struct pci_dev *pdev)
free_irq(pdev->irq, dev);
if (dev->quirks & PLX_PCIE)
pci_disable_msi(pdev);
- if (dev->regs)
- iounmap(dev->regs);
if (dev->region)
release_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
--
2.5.0
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| From | Alan Stern <stern@rowland.harvard.edu> |
|---|---|
| Date | 2017-05-02 16:40 +0200 |
| Message-ID | <tCH85-7Q0-13@gated-at.bofh.it> |
| In reply to | #1634126 |
On Mon, 1 May 2017, Gustavo A. R. Silva wrote:
> Add null check before dereferencing dev->regs pointer inside
> net2280_led_shutdown() function.
>
> Addresses-Coverity-ID: 101783
> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
> ---
> drivers/usb/gadget/udc/net2280.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
> index 3828c2e..1898a4b 100644
> --- a/drivers/usb/gadget/udc/net2280.c
> +++ b/drivers/usb/gadget/udc/net2280.c
> @@ -3573,7 +3573,11 @@ static void net2280_remove(struct pci_dev *pdev)
> BUG_ON(dev->driver);
>
> /* then clean up the resources we allocated during probe() */
> - net2280_led_shutdown(dev);
> +
> + if (dev->regs) {
> + net2280_led_shutdown(dev);
> + iounmap(dev->regs);
> + }
> if (dev->requests) {
> int i;
> for (i = 1; i < 5; i++) {
> @@ -3588,8 +3592,6 @@ static void net2280_remove(struct pci_dev *pdev)
> free_irq(pdev->irq, dev);
> if (dev->quirks & PLX_PCIE)
> pci_disable_msi(pdev);
> - if (dev->regs)
> - iounmap(dev->regs);
> if (dev->region)
> release_mem_region(pci_resource_start(pdev, 0),
> pci_resource_len(pdev, 0));
No, you must not move the iounmap() call, because an interrupt could
theoretically occur at any time.
Either just live with an extra test of dev->regs, or else move the
net2280_led_shutdown() call later.
Alan Stern
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| From | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| Date | 2017-05-02 18:00 +0200 |
| Subject | Re: [PATCH] usb: gadget: udc: add null check before pointer dereference |
| Message-ID | <tCInw-ek-17@gated-at.bofh.it> |
| In reply to | #1634461 |
Hi Alan,
Quoting Alan Stern <stern@rowland.harvard.edu>:
> On Mon, 1 May 2017, Gustavo A. R. Silva wrote:
>
>> Add null check before dereferencing dev->regs pointer inside
>> net2280_led_shutdown() function.
>>
>> Addresses-Coverity-ID: 101783
>> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
>> ---
>> drivers/usb/gadget/udc/net2280.c | 8 +++++---
>> 1 file changed, 5 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/usb/gadget/udc/net2280.c
>> b/drivers/usb/gadget/udc/net2280.c
>> index 3828c2e..1898a4b 100644
>> --- a/drivers/usb/gadget/udc/net2280.c
>> +++ b/drivers/usb/gadget/udc/net2280.c
>> @@ -3573,7 +3573,11 @@ static void net2280_remove(struct pci_dev *pdev)
>> BUG_ON(dev->driver);
>>
>> /* then clean up the resources we allocated during probe() */
>> - net2280_led_shutdown(dev);
>> +
>> + if (dev->regs) {
>> + net2280_led_shutdown(dev);
>> + iounmap(dev->regs);
>> + }
>> if (dev->requests) {
>> int i;
>> for (i = 1; i < 5; i++) {
>> @@ -3588,8 +3592,6 @@ static void net2280_remove(struct pci_dev *pdev)
>> free_irq(pdev->irq, dev);
>> if (dev->quirks & PLX_PCIE)
>> pci_disable_msi(pdev);
>> - if (dev->regs)
>> - iounmap(dev->regs);
>> if (dev->region)
>> release_mem_region(pci_resource_start(pdev, 0),
>> pci_resource_len(pdev, 0));
>
> No, you must not move the iounmap() call, because an interrupt could
> theoretically occur at any time.
>
Yeah, I was suspicious about it.
> Either just live with an extra test of dev->regs, or else move the
> net2280_led_shutdown() call later.
>
In this case I think it is safe to move the net2280_led_shutdown()
call, as the function is only turning off the LEDs.
I'll send a patch shortly.
Thank you
--
Gustavo A. R. Silva
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| From | "Gustavo A. R. Silva" <garsilva@embeddedor.com> |
|---|---|
| Date | 2017-05-02 19:10 +0200 |
| Subject | [PATCH v2] usb: gadget: udc: add null check before pointer dereference |
| Message-ID | <tCJtg-17y-23@gated-at.bofh.it> |
| In reply to | #1634492 |
Add null check before dereferencing dev->regs pointer inside
net2280_led_shutdown() function.
Addresses-Coverity-ID: 101783
Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
---
Changes in v2:
Move the net2280_led_shutdown() call later.
drivers/usb/gadget/udc/net2280.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index 3828c2e..4f5c0c4 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -3573,7 +3573,6 @@ static void net2280_remove(struct pci_dev *pdev)
BUG_ON(dev->driver);
/* then clean up the resources we allocated during probe() */
- net2280_led_shutdown(dev);
if (dev->requests) {
int i;
for (i = 1; i < 5; i++) {
@@ -3588,8 +3587,10 @@ static void net2280_remove(struct pci_dev *pdev)
free_irq(pdev->irq, dev);
if (dev->quirks & PLX_PCIE)
pci_disable_msi(pdev);
- if (dev->regs)
+ if (dev->regs) {
+ net2280_led_shutdown(dev);
iounmap(dev->regs);
+ }
if (dev->region)
release_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
--
2.5.0
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| From | Alan Stern <stern@rowland.harvard.edu> |
|---|---|
| Date | 2017-05-02 20:50 +0200 |
| Subject | Re: [PATCH v2] usb: gadget: udc: add null check before pointer dereference |
| Message-ID | <tCL22-1Ui-1@gated-at.bofh.it> |
| In reply to | #1634533 |
On Tue, 2 May 2017, Gustavo A. R. Silva wrote:
> Add null check before dereferencing dev->regs pointer inside
> net2280_led_shutdown() function.
>
> Addresses-Coverity-ID: 101783
> Cc: Alan Stern <stern@rowland.harvard.edu>
> Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
> ---
> Changes in v2:
> Move the net2280_led_shutdown() call later.
>
> drivers/usb/gadget/udc/net2280.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
> index 3828c2e..4f5c0c4 100644
> --- a/drivers/usb/gadget/udc/net2280.c
> +++ b/drivers/usb/gadget/udc/net2280.c
> @@ -3573,7 +3573,6 @@ static void net2280_remove(struct pci_dev *pdev)
> BUG_ON(dev->driver);
>
> /* then clean up the resources we allocated during probe() */
> - net2280_led_shutdown(dev);
> if (dev->requests) {
> int i;
> for (i = 1; i < 5; i++) {
> @@ -3588,8 +3587,10 @@ static void net2280_remove(struct pci_dev *pdev)
> free_irq(pdev->irq, dev);
> if (dev->quirks & PLX_PCIE)
> pci_disable_msi(pdev);
> - if (dev->regs)
> + if (dev->regs) {
> + net2280_led_shutdown(dev);
> iounmap(dev->regs);
> + }
> if (dev->region)
> release_mem_region(pci_resource_start(pdev, 0),
> pci_resource_len(pdev, 0));
Acked-by: Alan Stern <stern@rowland.harvard.edu>
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