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mobile: fix segfault on empty TRAFFIC.ind

The L1 PHY may emit empty TRAFFIC.ind in case of decoding errors.
Abort execution of pq_audio_sink early, otherwise we hit an assert.

Change-Id: Ice11b72ddfd51fbfb17a4c609c664b86a8f69591
---
M src/host/layer23/src/mobile/gapk_io.c
1 file changed, 16 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmocom-bb refs/changes/07/35507/1

diff --git a/src/host/layer23/src/mobile/gapk_io.c b/src/host/layer23/src/mobile/gapk_io.c
index 966d0f4..d6b84a5 100644
--- a/src/host/layer23/src/mobile/gapk_io.c
+++ b/src/host/layer23/src/mobile/gapk_io.c
@@ -57,6 +57,10 @@
 
 	/* Calculate received frame length */
 	frame_len = msgb_l3len(tch_msg);
+	if (frame_len == 0) {
+		msgb_free(tch_msg);
+		return -EIO;
+	}
 
 	/* Copy the frame bytes from message */
 	memcpy(out, tch_msg->l3h, frame_len);

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