fix possible NULL pointer dereference after call to configASSERT() (#1284)

Compiling with clang static code analysis, possible NULL pointer
dereference are found. Since configASSERT() can possibly return
and continue "normal" operation, the code in queue.c and
stream_buffer.c can be adjusted to avoid NULL pointer exceptions.

Signed-off-by: Florian La Roche <[email protected]>

Author: laroche

queue.c

@@ -1175,9 +1175,8 @@ BaseType_t xQueueGenericSendFromISR( QueueHandle_t xQueue,
 
     traceENTER_xQueueGenericSendFromISR( xQueue, pvItemToQueue, pxHigherPriorityTaskWoken, xCopyPosition );
 
-    configASSERT( pxQueue );
-    configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( UBaseType_t ) 0U ) ) );
-    configASSERT( !( ( xCopyPosition == queueOVERWRITE ) && ( pxQueue->uxLength != 1 ) ) );
+    configASSERT( ( pxQueue != NULL ) && !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( UBaseType_t ) 0U ) ) );
+    configASSERT( ( pxQueue != NULL ) && !( ( xCopyPosition == queueOVERWRITE ) && ( pxQueue->uxLength != 1 ) ) );
 
     /* RTOS ports that support interrupt nesting have the concept of a maximum
      * system call (or maximum API call) interrupt priority.  Interrupts that are
@@ -1351,16 +1350,14 @@ BaseType_t xQueueGiveFromISR( QueueHandle_t xQueue,
      * not (i.e. has a task with a higher priority than us been woken by this
      * post). */
 
-    configASSERT( pxQueue );
-
     /* xQueueGenericSendFromISR() should be used instead of xQueueGiveFromISR()
      * if the item size is not 0. */
-    configASSERT( pxQueue->uxItemSize == 0 );
+    configASSERT( ( pxQueue != NULL ) && ( pxQueue->uxItemSize == 0 ) );
 
     /* Normally a mutex would not be given from an interrupt, especially if
      * there is a mutex holder, as priority inheritance makes no sense for an
-     * interrupts, only tasks. */
-    configASSERT( !( ( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX ) && ( pxQueue->u.xSemaphore.xMutexHolder != NULL ) ) );
+     * interrupt, only tasks. */
+    configASSERT( ( pxQueue != NULL ) && !( ( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX ) && ( pxQueue->u.xSemaphore.xMutexHolder != NULL ) ) );
 
     /* RTOS ports that support interrupt nesting have the concept of a maximum
      * system call (or maximum API call) interrupt priority.  Interrupts that are
@@ -1895,12 +1892,9 @@ BaseType_t xQueuePeek( QueueHandle_t xQueue,
 
     traceENTER_xQueuePeek( xQueue, pvBuffer, xTicksToWait );
 
-    /* Check the pointer is not NULL. */
-    configASSERT( ( pxQueue ) );
-
     /* The buffer into which data is received can only be NULL if the data size
      * is zero (so no data is copied into the buffer. */
-    configASSERT( !( ( ( pvBuffer ) == NULL ) && ( ( pxQueue )->uxItemSize != ( UBaseType_t ) 0U ) ) );
+    configASSERT( ( pxQueue != NULL ) && !( ( ( pvBuffer ) == NULL ) && ( ( pxQueue )->uxItemSize != ( UBaseType_t ) 0U ) ) );
 
     /* Cannot block if the scheduler is suspended. */
     #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
@@ -2152,9 +2146,8 @@ BaseType_t xQueuePeekFromISR( QueueHandle_t xQueue,
 
     traceENTER_xQueuePeekFromISR( xQueue, pvBuffer );
 
-    configASSERT( pxQueue );
-    configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( UBaseType_t ) 0U ) ) );
-    configASSERT( pxQueue->uxItemSize != 0 ); /* Can't peek a semaphore. */
+    configASSERT( ( pxQueue != NULL ) && !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( UBaseType_t ) 0U ) ) );
+    configASSERT( ( pxQueue != NULL ) && ( pxQueue->uxItemSize != 0 ) ); /* Can't peek a semaphore. */
 
     /* RTOS ports that support interrupt nesting have the concept of a maximum
      * system call (or maximum API call) interrupt priority.  Interrupts that are

stream_buffer.c

@@ -1653,11 +1653,9 @@ void vStreamBufferSetStreamBufferNotificationIndex( StreamBufferHandle_t xStream
 
     traceENTER_vStreamBufferSetStreamBufferNotificationIndex( xStreamBuffer, uxNotificationIndex );
 
-    configASSERT( pxStreamBuffer );
-
     /* There should be no task waiting otherwise we'd never resume them. */
-    configASSERT( pxStreamBuffer->xTaskWaitingToReceive == NULL );
-    configASSERT( pxStreamBuffer->xTaskWaitingToSend == NULL );
+    configASSERT( ( pxStreamBuffer != NULL ) && ( pxStreamBuffer->xTaskWaitingToReceive == NULL ) );
+    configASSERT( ( pxStreamBuffer != NULL ) && ( pxStreamBuffer->xTaskWaitingToSend == NULL ) );
 
     /* Check that the task notification index is valid. */
     configASSERT( uxNotificationIndex < configTASK_NOTIFICATION_ARRAY_ENTRIES );