X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=libringbuffer%2Fring_buffer_backend.c;h=7d3a37809e73da27b25d43d8914ed285545075f7;hb=3d8e9399b2fb9000b3b55e488a7d04184b5bb56e;hp=0d2cc6d0359af249e4c65e4cd4f0b9d0efbe2f0f;hpb=866f2767f671ffbbff2c0511964f5a9a66358184;p=lttng-ust.git

diff --git a/libringbuffer/ring_buffer_backend.c b/libringbuffer/ring_buffer_backend.c
index 0d2cc6d0..7d3a3780 100644
--- a/libringbuffer/ring_buffer_backend.c
+++ b/libringbuffer/ring_buffer_backend.c
@@ -234,6 +234,12 @@ int channel_backend_init(struct channel_backend *chanb,
 		return -EINVAL;
 	if (!num_subbuf || (num_subbuf & (num_subbuf - 1)))
 		return -EINVAL;
+	/*
+	 * Overwrite mode buffers require at least 2 subbuffers per
+	 * buffer.
+	 */
+	if (config->mode == RING_BUFFER_OVERWRITE && num_subbuf < 2)
+		return -EINVAL;
 
 	ret = subbuffer_id_check_index(config, num_subbuf);
 	if (ret)