http api: fix NULL dereference for /api/hardware/satip/discover, fixes #3900

diff --git a/src/api/api_input.c b/src/api/api_input.c
index 97798634a7f539d2ade60db408d91f3fc6f13d2a..9e0c473c0101559cc4f6c77862c795e581e48277 100644 (file)
--- a/src/api/api_input.c
+++ b/src/api/api_input.c
@@ -43,7 +43,7 @@ api_input_satip_discover
 {
   int err = 0;
 
-  if (strcmp(op, "all"))
+  if (op == NULL || strcmp(op, "all"))
     return -EINVAL;
 
   tvhinfo("satip", "Triggered new server discovery");