Fix checking the return value of getentropy()

Reviewed-by: Andy Polyakov <appro@openssl.org>
GH: #6405

diff --git a/crypto/rand/rand_unix.c b/crypto/rand/rand_unix.c
index e698dfde651fbe69983ffc8450e8674a78d0f3d3..9f17494d118816af7eef2026300b1c0e439698e6 100644 (file)
--- a/crypto/rand/rand_unix.c
+++ b/crypto/rand/rand_unix.c
@@ -249,7 +249,7 @@ int syscall_random(void *buf, size_t buflen)
      */
     p_getentropy.p = DSO_global_lookup("getentropy");
     if (p_getentropy.p != NULL)
-        return p_getentropy.f(buf, buflen);
+        return p_getentropy.f(buf, buflen) == 0 ? buflen : 0;
 
     /* Linux supports this since version 3.17 */
 #  if defined(__linux) && defined(SYS_getrandom)