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rlcmac: llc_queue: Fix access to null msgb during dequeue

Change-Id: I513aaef6ad0f44b5a6d32be512bdd8b4fdabb4e7
---
M src/rlcmac/llc_queue.c
1 file changed, 3 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/libosmo-gprs refs/changes/42/31342/1

diff --git a/src/rlcmac/llc_queue.c b/src/rlcmac/llc_queue.c
index 2643b66..2c1aeea 100644
--- a/src/rlcmac/llc_queue.c
+++ b/src/rlcmac/llc_queue.c
@@ -207,7 +207,9 @@
 		       "new_queue_size=%zu\n", frames, octets, gprs_rlcmac_llc_queue_size(q));
 	}
 
-	msgb_pull_to_l2(msg);
+	if (!msg)
+		return NULL;
 
+	msgb_pull_to_l2(msg);
 	return msg;
 }

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