lib510: don't write past the end of the buffer if it's too small

1 files changed, 4 insertions, 0 deletions

diff --git a/tests/libtest/lib510.c b/tests/libtest/lib510.c
index 68588cfe6..4c290f1ef 100644
--- a/tests/libtest/lib510.c
+++ b/tests/libtest/lib510.c
@@ -48,6 +48,10 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
 
   if(data) {
     size_t len = strlen(data);
+    if(size*nmemb < len) {
+      fprintf(stderr, "read buffer is too small to run test\n");
+      return 0;
+    }
     memcpy(ptr, data, len);
     pooh->counter++; /* advance pointer */
     return len;