diff options
Diffstat (limited to 'kernel/events/ring_buffer.c')
| -rw-r--r-- | kernel/events/ring_buffer.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 4013408ce012..8cadf97bc290 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -682,13 +682,18 @@ int rb_alloc_aux(struct perf_buffer *rb, struct perf_event *event, if (!has_aux(event)) return -EOPNOTSUPP; + if (nr_pages <= 0) + return -EINVAL; + if (!overwrite) { /* * Watermark defaults to half the buffer, and so does the * max_order, to aid PMU drivers in double buffering. */ if (!watermark) - watermark = nr_pages << (PAGE_SHIFT - 1); + watermark = min_t(unsigned long, + U32_MAX, + (unsigned long)nr_pages << (PAGE_SHIFT - 1)); /* * Use aux_watermark as the basis for chunking to |