From 12b4dda856217cc60c6b392d4c5274a91e398198 Mon Sep 17 00:00:00 2001
From: Mike Black W9MDB <mdblack98@yahoo.com>
Date: Sat, 14 Aug 2021 17:56:32 -0500
Subject: [PATCH] Add a check in flrig to protect strdup from a NULL pointer
 https://github.com/Hamlib/Hamlib/issues/765

---
 rigs/dummy/flrig.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/rigs/dummy/flrig.c b/rigs/dummy/flrig.c
index c4ea99fdf..14e1a3279 100644
--- a/rigs/dummy/flrig.c
+++ b/rigs/dummy/flrig.c
@@ -144,7 +144,7 @@ const struct rig_caps flrig_caps =
     RIG_MODEL(RIG_MODEL_FLRIG),
     .model_name = "FLRig",
     .mfg_name = "FLRig",
-    .version = "202100721",
+    .version = "202100814",
     .copyright = "LGPL",
     .status = RIG_STATUS_STABLE,
     .rig_type = RIG_TYPE_TRANSCEIVER,
@@ -1414,7 +1414,13 @@ static int flrig_set_mode(RIG *rig, vfo_t vfo, rmode_t mode, pbwidth_t width)
     }
 
     // Set the mode
-    ttmode = strdup(modeMapGetFLRig(mode));
+    if (modeMapGetFLRig(mode)) {
+        ttmode = strdup(modeMapGetFLRig(mode));
+    }
+    else {
+        rig_debug(RIG_DEBUG_ERR, "%s: modeMapGetFlRig failed on mode=%d\n", __func__, (int)mode);
+        RETURNFUNC(-RIG_EINVAL);
+    }
     rig_debug(RIG_DEBUG_TRACE, "%s: got ttmode = %s\n", __func__,
               ttmode == NULL ? "NULL" : ttmode);