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SubjectRe: [PATCH] mwifiex: fix possible NULL dereference
From
On Mon, Apr 11, 2016 at 8:27 AM, Sudip Mukherjee
<sudipm.mukherjee@gmail.com> wrote:
>
> From: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
>
> 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 <sudip.mukherjee@codethink.co.uk>
> ---
> 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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