[PATCH v2 1/1] crypto: cavium/nitrox - don't cast parameter in bit operations

[PATCH v2 1/1] crypto: cavium/nitrox - don't cast parameter in bit operations

[Andy Shevchenko]

While in this particular case it would not be a (critical) issue,
the pattern itself is bad and error prone in case the location
of the parameter is changed.

Don't cast parameter to unsigned long pointer in the bit operations.
Instead copy to a local variable on stack of a proper type and use.

Fixes: cf718eaa8f9b ("crypto: cavium/nitrox - Enabled Mailbox support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: fixed typo (LKP, Herbert)
 drivers/crypto/cavium/nitrox/nitrox_mbx.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/cavium/nitrox/nitrox_mbx.c b/drivers/crypto/cavium/nitrox/nitrox_mbx.c
index 2e9c0d214363..9e7308e39b30 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_mbx.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_mbx.c
@@ -1,4 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
+#include <linux/bitmap.h>
 #include <linux/workqueue.h>
 
 #include "nitrox_csr.h"
@@ -120,6 +121,7 @@ static void pf2vf_resp_handler(struct work_struct *work)
 
 void nitrox_pf2vf_mbox_handler(struct nitrox_device *ndev)
 {
+	DECLARE_BITMAP(csr, BITS_PER_TYPE(u64));
 	struct nitrox_vfdev *vfdev;
 	struct pf2vf_work *pfwork;
 	u64 value, reg_addr;
@@ -129,7 +131,8 @@ void nitrox_pf2vf_mbox_handler(struct nitrox_device *ndev)
 	/* loop for VF(0..63) */
 	reg_addr = NPS_PKT_MBOX_INT_LO;
 	value = nitrox_read_csr(ndev, reg_addr);
-	for_each_set_bit(i, (const unsigned long *)&value, BITS_PER_LONG) {
+	bitmap_from_u64(csr, value);
+	for_each_set_bit(i, csr, BITS_PER_TYPE(csr)) {
 		/* get the vfno from ring */
 		vfno = RING_TO_VFNO(i, ndev->iov.max_vf_queues);
 		vfdev = ndev->iov.vfdev + vfno;
@@ -151,7 +154,8 @@ void nitrox_pf2vf_mbox_handler(struct nitrox_device *ndev)
 	/* loop for VF(64..127) */
 	reg_addr = NPS_PKT_MBOX_INT_HI;
 	value = nitrox_read_csr(ndev, reg_addr);
-	for_each_set_bit(i, (const unsigned long *)&value, BITS_PER_LONG) {
+	bitmap_from_u64(csr, value);
+	for_each_set_bit(i, csr, BITS_PER_TYPE(csr)) {
 		/* get the vfno from ring */
 		vfno = RING_TO_VFNO(i + 64, ndev->iov.max_vf_queues);
 		vfdev = ndev->iov.vfdev + vfno;
-- 
2.34.1

Re: [PATCH v2 1/1] crypto: cavium/nitrox - don't cast parameter in bit operations

[Andy Shevchenko]

On Wed, Feb 23, 2022 at 06:26:20PM +0200, Andy Shevchenko wrote:
> While in this particular case it would not be a (critical) issue,
> the pattern itself is bad and error prone in case the location
> of the parameter is changed.
> 
> Don't cast parameter to unsigned long pointer in the bit operations.
> Instead copy to a local variable on stack of a proper type and use.

Is this fix already applied?

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 1/1] crypto: cavium/nitrox - don't cast parameter in bit operations

[Herbert Xu]

On Wed, Feb 23, 2022 at 06:26:20PM +0200, Andy Shevchenko wrote:
> While in this particular case it would not be a (critical) issue,
> the pattern itself is bad and error prone in case the location
> of the parameter is changed.
> 
> Don't cast parameter to unsigned long pointer in the bit operations.
> Instead copy to a local variable on stack of a proper type and use.
> 
> Fixes: cf718eaa8f9b ("crypto: cavium/nitrox - Enabled Mailbox support")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
> v2: fixed typo (LKP, Herbert)
>  drivers/crypto/cavium/nitrox/nitrox_mbx.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt