conntrackd: fix crash for unubuffered channel on exit path

This patch fixes a crash in the exit path for channels that
are not buffered (no CHANNEL_F_BUFFERED flag set). This fix
does not affect any existing channel in the tree.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/channel.c b/src/channel.c
index 255026a..9d74b7f 100644
--- a/src/channel.c
+++ b/src/channel.c
@@ -57,6 +57,9 @@ channel_buffer_open(int mtu)
 static void
 channel_buffer_close(struct channel_buffer *b)
 {
+	if (b == NULL)
+		return;
+
 	free(b->data);
 	free(b);
 }