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lapd: Take talloc msgb ownsership when enqueueing it

Otherwise the msg talloc rererence is kept parented at some unknown
pointer in some unknown upper layer.

Related: OS#6728
Change-Id: I32729060b5a18576310b3789da522f4392d9611e
---
M src/isdn/lapd_core.c
1 file changed, 2 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/07/39807/1

diff --git a/src/isdn/lapd_core.c b/src/isdn/lapd_core.c
index b32ed26..b26edfc 100644
--- a/src/isdn/lapd_core.c
+++ b/src/isdn/lapd_core.c
@@ -1922,6 +1922,8 @@
 
 	LOGDL(dl, LOGL_INFO, "writing message to send-queue: l3len: %d\n", msgb_l3len(msg));
 
+	/* Take ownsership of msg, since we are keeping it around in this layer: */
+	talloc_steal(tall_lapd_ctx, msg);
 	/* Write data into the send queue */
 	msgb_enqueue(&dl->send_queue, msg);
 

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