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Fix: refuse overwrite mode buffers with less than two subbuffers
[lttng-ust.git]
/
libringbuffer
/
ring_buffer_backend.c
diff --git
a/libringbuffer/ring_buffer_backend.c
b/libringbuffer/ring_buffer_backend.c
index 0d2cc6d0359af249e4c65e4cd4f0b9d0efbe2f0f..7d3a37809e73da27b25d43d8914ed285545075f7 100644
(file)
--- 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;
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)
ret = subbuffer_id_check_index(config, num_subbuf);
if (ret)
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