Re: [PATCH 1/2] crypto: stm32 - Fix uninitialized data usage

[Herbert Xu]

On Tue, Sep 12, 2017 at 11:35:38AM +0200, Arnd Bergmann wrote:
> The error handling in stm32_hash_irq_thread passes
> uninitialized data into stm32_hash_finish_req, as gcc
> points out:
> 
> drivers/crypto/stm32/stm32-hash.c: In function 'stm32_hash_irq_thread':
> drivers/crypto/stm32/stm32-hash.c:1088:2: error: 'err' may be used 
> uninitialized in this function [-Werror=maybe-uninitialized]
> 
> I could not tell what data should be passed there instead,
> so this changes the code to always pass zero, making it
> well-defined, though possibly still wrong. Please check.
> 
> Signed-off-by: Arnd Bergmann 

This is already fixed in cryptodev.
-- 
Email: Herbert Xu 
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

Re: [PATCH 1/2] crypto: stm32 - Fix uninitialized data usage

[Lionel DEBIEVE]

Hi Arnd,

I've already push this fix for review last month, waiting the ack.

"
From: Lionel Debieve 
To: Herbert Xu , "David S . Miller"
, Maxime Coquelin , 
Alexandre
  Torgue , ,
, 
CC: Benjamin Gaignard , Fabien Dessenne
, Ludovic Barre 
Subject: [PATCH 1/1] crypto: stm32/hash - Remove uninitialized symbol
Date: Fri, 18 Aug 2017 15:54:01 +0200
"

Sorry if you receive this mail twice, I didn't see any mail in the mailing 
list, maybe server issue.

I'm reviewing your second part patch.

BR,

Lionel

> On 09/12/2017 11:35 AM, Arnd Bergmann wrote:
>> The error handling in stm32_hash_irq_thread passes
>> uninitialized data into stm32_hash_finish_req, as gcc
>> points out:
>> drivers/crypto/stm32/stm32-hash.c: In function 'stm32_hash_irq_thread':
>> drivers/crypto/stm32/stm32-hash.c:1088:2: error: 'err' may be used 
>> uninitialized in this function [-Werror=maybe-uninitialized]
>> I could not tell what data should be passed there instead,
>> so this changes the code to always pass zero, making it
>> well-defined, though possibly still wrong. Please check.
>> Signed-off-by: Arnd Bergmann 
>> ---
>>drivers/crypto/stm32/stm32-hash.c | 3 +--
>>1 file changed, 1 insertion(+), 2 deletions(-)
>> diff --git a/drivers/crypto/stm32/stm32-hash.c 
>> b/drivers/crypto/stm32/stm32-hash.c
>> index b585ce54a802..3c23a23e9ee5 100644
>> --- a/drivers/crypto/stm32/stm32-hash.c
>> +++ b/drivers/crypto/stm32/stm32-hash.c
>> @@ -1067,7 +1067,6 @@ static int stm32_hash_cra_sha256_init(struct 
>> crypto_tfm *tfm)
>>static irqreturn_t stm32_hash_irq_thread(int irq, void *dev_id)
>>{
>>struct stm32_hash_dev *hdev = dev_id;
>> -int err;
>>
>>if (HASH_FLAGS_CPU & hdev->flags) {
>>if (HASH_FLAGS_OUTPUT_READY & hdev->flags) {
>> @@ -1085,7 +1084,7 @@ static irqreturn_t stm32_hash_irq_thread(int irq, void 
>> *dev_id)
>>
>>finish:
>>/*Finish current request */
>> -stm32_hash_finish_req(hdev->req, err);
>> +stm32_hash_finish_req(hdev->req, 0);
>>
>>return IRQ_HANDLED;
>>}
>

[PATCH 1/2] crypto: stm32 - Fix uninitialized data usage

[Arnd Bergmann]

The error handling in stm32_hash_irq_thread passes
uninitialized data into stm32_hash_finish_req, as gcc
points out:

drivers/crypto/stm32/stm32-hash.c: In function 'stm32_hash_irq_thread':
drivers/crypto/stm32/stm32-hash.c:1088:2: error: 'err' may be used 
uninitialized in this function [-Werror=maybe-uninitialized]

I could not tell what data should be passed there instead,
so this changes the code to always pass zero, making it
well-defined, though possibly still wrong. Please check.

Signed-off-by: Arnd Bergmann 
---
 drivers/crypto/stm32/stm32-hash.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c 
b/drivers/crypto/stm32/stm32-hash.c
index b585ce54a802..3c23a23e9ee5 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -1067,7 +1067,6 @@ static int stm32_hash_cra_sha256_init(struct crypto_tfm 
*tfm)
 static irqreturn_t stm32_hash_irq_thread(int irq, void *dev_id)
 {
struct stm32_hash_dev *hdev = dev_id;
-   int err;
 
if (HASH_FLAGS_CPU & hdev->flags) {
if (HASH_FLAGS_OUTPUT_READY & hdev->flags) {
@@ -1085,7 +1084,7 @@ static irqreturn_t stm32_hash_irq_thread(int irq, void 
*dev_id)
 
 finish:
/*Finish current request */
-   stm32_hash_finish_req(hdev->req, err);
+   stm32_hash_finish_req(hdev->req, 0);
 
return IRQ_HANDLED;
 }
-- 
2.9.0