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

[Jiri Olsa]

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.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 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