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lapd_core: Fix crash in lapd_est_req() function

lapd_est_req() function could be called on uninitialized lapd link
(before lapd_dl_init() and after lapd_dl_exit() functions) due to
invalid usage on higher levels.
In order to prevent using uninitialized lapd link, we should set
LAPD_STATE_NULL state for lapd_datalink in lapd_dl_exit() function.
So all messages for lapd_datalink in null state will be unhandled by
lapd_recv_dlsap() function and lapd_est_req() function will not be
called before lapd_dl_init() function where lapd link state is changed
to idle.

Change-Id: I306dad9b78e3becaef14c5305ec25c312feefe3c
Related: OS#1982
M src/gsm/lapd_core.c
1 file changed, 4 insertions(+), 0 deletions(-)

  git pull ssh:// refs/changes/67/3467/1

diff --git a/src/gsm/lapd_core.c b/src/gsm/lapd_core.c
index 166bf9a..6b58006 100644
--- a/src/gsm/lapd_core.c
+++ b/src/gsm/lapd_core.c
@@ -326,6 +326,10 @@
        /* free all ressources except history buffer */
+       /* enter null state */
+       lapd_dl_newstate(dl, LAPD_STATE_NULL);
        /* free history buffer list */
        dl->tx_hist = NULL;

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Gerrit-MessageType: newchange
Gerrit-Change-Id: I306dad9b78e3becaef14c5305ec25c312feefe3c
Gerrit-PatchSet: 1
Gerrit-Project: libosmocore
Gerrit-Branch: master
Gerrit-Owner: Ivan Kluchnikov <>

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