Fix: don't dereference NULL pointers

[deliverable/lttng-ust.git] / liblttng-ust / lttng-ring-buffer-metadata-client.h

diff --git a/liblttng-ust/lttng-ring-buffer-metadata-client.h b/liblttng-ust/lttng-ring-buffer-metadata-client.h
index 921549faff4c8cc95ff5e3afe2c41aa653cc4c1c..ed8db359fa1a089563ec09652b8b2e167d959bf5 100644 (file)
--- a/liblttng-ust/lttng-ring-buffer-metadata-client.h
+++ b/liblttng-ust/lttng-ring-buffer-metadata-client.h
@@ -101,6 +101,9 @@ static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t
                                handle);
        struct lttng_channel *lttng_chan = channel_get_private(chan);
 
+       assert(header);
+       if (!header)
+               return;
        header->magic = TSDL_MAGIC_NUMBER;
        memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid));
        header->checksum = 0;           /* 0 if unused */
@@ -129,6 +132,9 @@ static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t ts
                                handle);
        unsigned long records_lost = 0;
 
+       assert(header);
+       if (!header)
+               return;
        header->content_size = data_size * CHAR_BIT;            /* in bits */
        header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
        /*