Re: [PATCH 1/3] perf: Return proper values for user stack errors

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Em Sun, Apr 15, 2018 at 11:23:50AM +0200, Jiri Olsa escreveu:
> Return immediately when we find issue in the user
> stack checks. The error value could get overwritten
> by following check for PERF_SAMPLE_REGS_INTR.

Applied, together with a:

Cc: Stephane Eranian <eranian@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Fixes: 60e2364e60e8 ("perf: Add ability to sample machine state on interrupt")
 
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  kernel/events/core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index fc1c330c6bd6..4d997bc064d2 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -10191,9 +10191,9 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
>  		 * __u16 sample size limit.
>  		 */
>  		if (attr->sample_stack_user >= USHRT_MAX)
> -			ret = -EINVAL;
> +			return -EINVAL;
>  		else if (!IS_ALIGNED(attr->sample_stack_user, sizeof(u64)))
> -			ret = -EINVAL;
> +			return -EINVAL;
>  	}
>  
>  	if (!attr->sample_max_stack)
> -- 
> 2.13.6