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-rw-r--r--openbsc/src/gsm_04_11.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/openbsc/src/gsm_04_11.c b/openbsc/src/gsm_04_11.c
index 31526e979..17a583113 100644
--- a/openbsc/src/gsm_04_11.c
+++ b/openbsc/src/gsm_04_11.c
@@ -560,7 +560,8 @@ static int gsm340_rx_tpdu(struct msgb *msg)
case GSM340_TP_VPF_ENHANCED:
sms_vp = smsp;
/* the additional functionality indicator... */
- if (*smsp & (1<<7)) smsp++;
+ if (sms_vpf == GSM340_TP_VPF_ENHANCED && *smsp & (1<<7))
+ smsp++;
smsp += 7;
break;
case GSM340_TP_VPF_NONE: