lynxis lazus has uploaded this change for review.

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gprs_ms_net_cap_gea_mask(): protect against empty MS Network Capabilities

When the MS Network Capability is empty, expect to support at least unecnrypted
communications.
This shouldn't be empty at all.

Change-Id: Ieef2e3eeaaadc90c35fff6f20d47bd36aaa4b9e6
---
M src/sgsn/gprs_gmm.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-sgsn refs/changes/43/39243/1

diff --git a/src/sgsn/gprs_gmm.c b/src/sgsn/gprs_gmm.c
index 7c1614b..5ed190b 100644
--- a/src/sgsn/gprs_gmm.c
+++ b/src/sgsn/gprs_gmm.c
@@ -1201,6 +1201,10 @@
 static uint8_t gprs_ms_net_cap_gea_mask(const uint8_t *ms_net_cap, uint8_t cap_len)
 {
 	uint8_t mask = (1 << GPRS_ALGO_GEA0);
+
+	if (cap_len == 0)
+		return mask;
+
 	mask |= (0x80 & ms_net_cap[0]) ? (1 << GPRS_ALGO_GEA1) : 0;
 
 	if (cap_len < 2)

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