conv: prevent theoretical NULL pointer dereference in osmo_conv_encode()

A caller shall never pass NULL to osmo_conv_encode().

Change-Id: Ice0050cd7c7e3fcbf57c2c73682ca28843a92d8b
Fixes: CID#208174

1 files changed, 2 insertions, 0 deletions

diff --git a/src/conv.c b/src/conv.c
index a2c13def..06c4299b 100644
--- a/src/conv.c
+++ b/src/conv.c
@@ -36,6 +36,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <osmocom/core/utils.h>
 #include <osmocom/core/bits.h>
 #include <osmocom/core/conv.h>
 
@@ -87,6 +88,7 @@ osmo_conv_encode_init(struct osmo_conv_encoder *encoder,
                       const struct osmo_conv_code *code)
 {
 	memset(encoder, 0x00, sizeof(struct osmo_conv_encoder));
+	OSMO_ASSERT(code != NULL);
 	encoder->code = code;
 }