From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 23 Sep 2011 16:31:59 +0000 (-0400)
Subject: Check for num cpus
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=e095d8031307428069e549360284388e06683293;p=ust.git

Check for num cpus

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/libringbuffer/ring_buffer_frontend.c b/libringbuffer/ring_buffer_frontend.c
index 5e6d4df..0b4b89f 100644
--- a/libringbuffer/ring_buffer_frontend.c
+++ b/libringbuffer/ring_buffer_frontend.c
@@ -643,6 +643,8 @@ struct lib_ring_buffer *channel_get_ring_buffer(
 			memory_map_size);
 		return shmp(handle, chan->backend.buf[0].shmp);
 	} else {
+		if (cpu >= num_possible_cpus())
+			return NULL;
 		ref = &chan->backend.buf[cpu].shmp._ref;
 		shm_get_object_data(handle, ref, shm_fd, wait_fd,
 			memory_map_size);