Re: [PATCH] mwifiex: fix possible NULL dereference

[Andy Shevchenko]

On Mon, Apr 11, 2016 at 6:27 PM, Sudip Mukherjee
 wrote:
> From: Sudip Mukherjee 
>
> We have a check for card just after dereferencing it. So if it is NULL
> we have already dereferenced it before its check. Lets dereference it
> after checking card for NULL.

IIUC the code does nothing with dereference.

I would have told NAK if I would have been maintainer.

>
> Signed-off-by: Sudip Mukherjee 
> ---
>  drivers/net/wireless/marvell/mwifiex/pcie.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c 
> b/drivers/net/wireless/marvell/mwifiex/pcie.c
> index edf8b07..84562d0 100644
> --- a/drivers/net/wireless/marvell/mwifiex/pcie.c
> +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
> @@ -2884,10 +2884,11 @@ static void mwifiex_unregister_dev(struct 
> mwifiex_adapter *adapter)
>  {
> struct pcie_service_card *card = adapter->card;

Let's say it's 0.

> const struct mwifiex_pcie_card_reg *reg;
> -   struct pci_dev *pdev = card->dev;

This would be equal to offset of dev member in pcie_service_card struct.

Nothing wrong here.

> +   struct pci_dev *pdev;
> int i;
>
> if (card) {
> +   pdev = card->dev;
> if (card->msix_enable) {
> for (i = 0; i < MWIFIEX_NUM_MSIX_VECTORS; i++)
> synchronize_irq(card->msix_entries[i].vector);
> --
> 1.9.1
>



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With Best Regards,
Andy Shevchenko
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Re: [PATCH] mwifiex: fix possible NULL dereference

[Christian Daudt]

On Mon, Apr 11, 2016 at 8:27 AM, Sudip Mukherjee
 wrote:
>
> From: Sudip Mukherjee 
>
> We have a check for card just after dereferencing it. So if it is NULL
> we have already dereferenced it before its check. Lets dereference it
> after checking card for NULL.
>
> Signed-off-by: Sudip Mukherjee 
> ---
>  drivers/net/wireless/marvell/mwifiex/pcie.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c 
> b/drivers/net/wireless/marvell/mwifiex/pcie.c
> index edf8b07..84562d0 100644
> --- a/drivers/net/wireless/marvell/mwifiex/pcie.c
> +++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
> @@ -2884,10 +2884,11 @@ static void mwifiex_unregister_dev(struct 
> mwifiex_adapter *adapter)
>  {
> struct pcie_service_card *card = adapter->card;
> const struct mwifiex_pcie_card_reg *reg;
> -   struct pci_dev *pdev = card->dev;
> +   struct pci_dev *pdev;


you might want to move the variable declaration into the if block
below to avoid it being left undefined

> int i;
>
> if (card) {
> +   pdev = card->dev;


to here
  +struct pci_dev pdev = card->dev;

>
> if (card->msix_enable) {
> for (i = 0; i < MWIFIEX_NUM_MSIX_VECTORS; i++)
> synchronize_irq(card->msix_entries[i].vector);
>

cheers,
  csd
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[PATCH] mwifiex: fix possible NULL dereference

[Sudip Mukherjee]

From: Sudip Mukherjee 

We have a check for card just after dereferencing it. So if it is NULL
we have already dereferenced it before its check. Lets dereference it
after checking card for NULL.

Signed-off-by: Sudip Mukherjee 
---
 drivers/net/wireless/marvell/mwifiex/pcie.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/pcie.c 
b/drivers/net/wireless/marvell/mwifiex/pcie.c
index edf8b07..84562d0 100644
--- a/drivers/net/wireless/marvell/mwifiex/pcie.c
+++ b/drivers/net/wireless/marvell/mwifiex/pcie.c
@@ -2884,10 +2884,11 @@ static void mwifiex_unregister_dev(struct 
mwifiex_adapter *adapter)
 {
struct pcie_service_card *card = adapter->card;
const struct mwifiex_pcie_card_reg *reg;
-   struct pci_dev *pdev = card->dev;
+   struct pci_dev *pdev;
int i;
 
if (card) {
+   pdev = card->dev;
if (card->msix_enable) {
for (i = 0; i < MWIFIEX_NUM_MSIX_VECTORS; i++)
synchronize_irq(card->msix_entries[i].vector);
-- 
1.9.1

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