[PATCH RESEND] staging: vme_user: reorder NULL check after kzalloc in fake_crcsr_init

[PATCH RESEND] staging: vme_user: reorder NULL check after kzalloc in fake_crcsr_init

[Artem Lytkin]

Move the NULL check for bridge->crcsr_kernel before its use in
fake_ptr_to_pci(). While fake_ptr_to_pci() is a simple cast that
handles NULL safely, using a value before validating it is a bad
pattern that static analyzers flag and could become a real issue
if fake_ptr_to_pci() changes in the future.

Signed-off-by: Artem Lytkin <iprintercanon@gmail.com>
---
 drivers/staging/vme_user/vme_fake.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/vme_user/vme_fake.c b/drivers/staging/vme_user/vme_fake.c
index 434cf760ade6c..5a4e61d204796 100644
--- a/drivers/staging/vme_user/vme_fake.c
+++ b/drivers/staging/vme_user/vme_fake.c
@@ -1029,9 +1029,9 @@ static int fake_crcsr_init(struct vme_bridge *fake_bridge)
 
 	/* Allocate mem for CR/CSR image */
 	bridge->crcsr_kernel = kzalloc(VME_CRCSR_BUF_SIZE, GFP_KERNEL);
-	bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);
 	if (!bridge->crcsr_kernel)
 		return -ENOMEM;
+	bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);
 
 	vstat = fake_slot_get(fake_bridge);
 
-- 
2.43.0

Re: [PATCH RESEND] staging: vme_user: reorder NULL check after kzalloc in fake_crcsr_init

[Greg KH]

On Thu, Jul 23, 2026 at 07:18:46PM +0300, Artem Lytkin wrote:
> Move the NULL check for bridge->crcsr_kernel before its use in
> fake_ptr_to_pci(). While fake_ptr_to_pci() is a simple cast that
> handles NULL safely, using a value before validating it is a bad
> pattern that static analyzers flag and could become a real issue
> if fake_ptr_to_pci() changes in the future.

Let's worry about that in the future, as this does not actually do
anything at all.

> 
> Signed-off-by: Artem Lytkin <iprintercanon@gmail.com>
> ---
>  drivers/staging/vme_user/vme_fake.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/vme_user/vme_fake.c b/drivers/staging/vme_user/vme_fake.c
> index 434cf760ade6c..5a4e61d204796 100644
> --- a/drivers/staging/vme_user/vme_fake.c
> +++ b/drivers/staging/vme_user/vme_fake.c
> @@ -1029,9 +1029,9 @@ static int fake_crcsr_init(struct vme_bridge *fake_bridge)
>  
>  	/* Allocate mem for CR/CSR image */
>  	bridge->crcsr_kernel = kzalloc(VME_CRCSR_BUF_SIZE, GFP_KERNEL);
> -	bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);

Again, assigning NULL to a value is just fine.

thanks,

greg k-h