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-rw-r--r--drivers/isdn/capi/capiutil.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/isdn/capi/capiutil.c b/drivers/isdn/capi/capiutil.c
index c7c29022a23..16f2e465e5f 100644
--- a/drivers/isdn/capi/capiutil.c
+++ b/drivers/isdn/capi/capiutil.c
@@ -989,6 +989,8 @@ _cdebbuf *capi_cmsg2str(_cmsg * cmsg)
{
_cdebbuf *cdb;
+ if (!cmsg->m)
+ return NULL; /* no message */
cdb = cdebbuf_alloc();
if (!cdb)
return NULL;