adapter->dcb would get silently freed inside qlcnic_dcb_enable() in
case qlcnic_dcb_attach() would return an error, which always happens
under OOM conditions. This would lead to use-after-free because both
of the existing callers invoke qlcnic_dcb_get_info() on the obtained
pointer, which is potentially freed at that point.

Propagate errors from qlcnic_dcb_enable(), and instead free the dcb
pointer at callsite using qlcnic_dcb_free(). This also removes the now
unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around
kfree() also causing memory leaks for partially initialized dcb.

Found by Linux Verification Center (linuxtesting.org) with the SVACE
static analysis tool.

Fixes: 3c44bba1d270 ("qlcnic: Disable DCB operations from SR-IOV VFs")
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
---
Changes since v1:
- Add a fixes tag + net as a target
- Remove qlcnic_clear_dcb_ops entirely & use qlcnic_dcb_free instead
---
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c |  9 ++++++++-
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h       | 10 ++--------
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c      |  9 ++++++++-
 3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
index dbb800769cb6..774f2c6875ec 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
@@ -2505,7 +2505,14 @@ int qlcnic_83xx_init(struct qlcnic_adapter *adapter)
 		goto disable_mbx_intr;
 
 	qlcnic_83xx_clear_function_resources(adapter);
-	qlcnic_dcb_enable(adapter->dcb);
+
+	err = qlcnic_dcb_enable(adapter->dcb);
+	if (err) {
+		qlcnic_dcb_free(adapter->dcb);
+		adapter->dcb = NULL;
+		goto disable_mbx_intr;
+	}
+
 	qlcnic_83xx_initialize_nic(adapter, 1);
 	qlcnic_dcb_get_info(adapter->dcb);
 
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h
index 7519773eaca6..22afa2be85fd 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h
@@ -41,11 +41,6 @@ struct qlcnic_dcb {
 	unsigned long			state;
 };
 
-static inline void qlcnic_clear_dcb_ops(struct qlcnic_dcb *dcb)
-{
-	kfree(dcb);
-}
-
 static inline int qlcnic_dcb_get_hw_capability(struct qlcnic_dcb *dcb)
 {
 	if (dcb && dcb->ops->get_hw_capability)
@@ -112,9 +107,8 @@ static inline void qlcnic_dcb_init_dcbnl_ops(struct qlcnic_dcb *dcb)
 		dcb->ops->init_dcbnl_ops(dcb);
 }
 
-static inline void qlcnic_dcb_enable(struct qlcnic_dcb *dcb)
+static inline int qlcnic_dcb_enable(struct qlcnic_dcb *dcb)
 {
-	if (dcb && qlcnic_dcb_attach(dcb))
-		qlcnic_clear_dcb_ops(dcb);
+	return dcb ? qlcnic_dcb_attach(dcb) : 0;
 }
 #endif
diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
index 28476b982bab..288eae201a31 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c
@@ -2599,7 +2599,14 @@ qlcnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			 "Device does not support MSI interrupts\n");
 
 	if (qlcnic_82xx_check(adapter)) {
-		qlcnic_dcb_enable(adapter->dcb);
+		err = qlcnic_dcb_enable(adapter->dcb);
+		if (err) {
+			qlcnic_dcb_free(adapter->dcb);
+			adapter->dcb = NULL;
+			dev_err(&pdev->dev, "Failed to enable DCB\n");
+			goto err_out_free_hw;
+		}
+
 		qlcnic_dcb_get_info(adapter->dcb);
 		err = qlcnic_setup_intr(adapter);
 
-- 
2.25.1

On Thu, Dec 22, 2022 at 10:42:23AM +0300, Daniil Tatianin wrote:
> adapter->dcb would get silently freed inside qlcnic_dcb_enable() in
> case qlcnic_dcb_attach() would return an error, which always happens
> under OOM conditions. This would lead to use-after-free because both
> of the existing callers invoke qlcnic_dcb_get_info() on the obtained
> pointer, which is potentially freed at that point.
> 
> Propagate errors from qlcnic_dcb_enable(), and instead free the dcb
> pointer at callsite using qlcnic_dcb_free(). This also removes the now
> unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around
> kfree() also causing memory leaks for partially initialized dcb.
> 
> Found by Linux Verification Center (linuxtesting.org) with the SVACE
> static analysis tool.
> 
> Fixes: 3c44bba1d270 ("qlcnic: Disable DCB operations from SR-IOV VFs")
> Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
> ---
> Changes since v1:
> - Add a fixes tag + net as a target
> - Remove qlcnic_clear_dcb_ops entirely & use qlcnic_dcb_free instead
> ---
>  drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c |  9 ++++++++-
>  drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h       | 10 ++--------
>  drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c      |  9 ++++++++-
>  3 files changed, 18 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
> index dbb800769cb6..774f2c6875ec 100644
> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
> @@ -2505,7 +2505,14 @@ int qlcnic_83xx_init(struct qlcnic_adapter *adapter)
>  		goto disable_mbx_intr;
>  
>  	qlcnic_83xx_clear_function_resources(adapter);
> -	qlcnic_dcb_enable(adapter->dcb);
> +
> +	err = qlcnic_dcb_enable(adapter->dcb);
> +	if (err) {
> +		qlcnic_dcb_free(adapter->dcb);
> +		adapter->dcb = NULL;
Small nit, I think qlcnic_dcb_free() already set adapter->dcb to NULL.

Otherwise, thanks for changing:
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>

Thanks,
Michal

[...]
> -- 
> 2.25.1

On 12/22/22 12:57 PM, Michal Swiatkowski wrote:
> On Thu, Dec 22, 2022 at 10:42:23AM +0300, Daniil Tatianin wrote:
>> adapter->dcb would get silently freed inside qlcnic_dcb_enable() in
>> case qlcnic_dcb_attach() would return an error, which always happens
>> under OOM conditions. This would lead to use-after-free because both
>> of the existing callers invoke qlcnic_dcb_get_info() on the obtained
>> pointer, which is potentially freed at that point.
>>
>> Propagate errors from qlcnic_dcb_enable(), and instead free the dcb
>> pointer at callsite using qlcnic_dcb_free(). This also removes the now
>> unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around
>> kfree() also causing memory leaks for partially initialized dcb.
>>
>> Found by Linux Verification Center (linuxtesting.org) with the SVACE
>> static analysis tool.
>>
>> Fixes: 3c44bba1d270 ("qlcnic: Disable DCB operations from SR-IOV VFs")
>> Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
>> ---
>> Changes since v1:
>> - Add a fixes tag + net as a target
>> - Remove qlcnic_clear_dcb_ops entirely & use qlcnic_dcb_free instead
>> ---
>>   drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c |  9 ++++++++-
>>   drivers/net/ethernet/qlogic/qlcnic/qlcnic_dcb.h       | 10 ++--------
>>   drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c      |  9 ++++++++-
>>   3 files changed, 18 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
>> index dbb800769cb6..774f2c6875ec 100644
>> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
>> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_init.c
>> @@ -2505,7 +2505,14 @@ int qlcnic_83xx_init(struct qlcnic_adapter *adapter)
>>   		goto disable_mbx_intr;
>>   
>>   	qlcnic_83xx_clear_function_resources(adapter);
>> -	qlcnic_dcb_enable(adapter->dcb);
>> +
>> +	err = qlcnic_dcb_enable(adapter->dcb);
>> +	if (err) {
>> +		qlcnic_dcb_free(adapter->dcb);
>> +		adapter->dcb = NULL;
> Small nit, I think qlcnic_dcb_free() already set adapter->dcb to NULL.
Oops, you're right. Thanks for spotting.
> Otherwise, thanks for changing:
> Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
> 
> Thanks,
> Michal
> 
> [...]
>> -- 
>> 2.25.1