[lttng-dev] [PATCH lttng-tools] Fix: Move initialization of queue_pipe_fd after null check of handle

[Jérémie Galarneau]

Merged in master and stable-2.11, but slightly modified to drop the
'const' qualifier and maintain the convention of declaring variables
at the earliest point in the scope.

Thanks!
Jérémie

On Fri, Sep 20, 2019 at 11:07:55AM -0400, Jonathan Rajotte wrote:
> Fixes coverity #1399732
> 
> Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien at efficios.com>
> ---
>  src/bin/lttng-sessiond/rotation-thread.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/src/bin/lttng-sessiond/rotation-thread.c b/src/bin/lttng-sessiond/rotation-thread.c
> index 7bd6c6819..1ee3974f0 100644
> --- a/src/bin/lttng-sessiond/rotation-thread.c
> +++ b/src/bin/lttng-sessiond/rotation-thread.c
> @@ -832,8 +832,6 @@ void *thread_rotation(void *data)
>  	int ret;
>  	struct rotation_thread_handle *handle = data;
>  	struct rotation_thread thread;
> -	const int queue_pipe_fd = lttng_pipe_get_readfd(
> -			handle->rotation_timer_queue->event_pipe);
>  
>  	DBG("[rotation-thread] Started rotation thread");
>  
> @@ -842,6 +840,10 @@ void *thread_rotation(void *data)
>  		goto end;
>  	}
>  
> +	/* Must be after null checking of handle for const assignment */
> +	const int queue_pipe_fd = lttng_pipe_get_readfd(
> +			handle->rotation_timer_queue->event_pipe);
> +
>  	rcu_register_thread();
>  	rcu_thread_online();
>  
> -- 
> 2.17.1
>