lib/randutils.c: More paranoia in getrandom() call.

If getrandom() is called with nbytes ≥ 256 then it can return with less than the requested
bytes filled.

In this case we *could* adjust the buffer by the number of bytes actually read, but it's
simpler to just redo the call.

diff --git a/lib/randutils.c b/lib/randutils.c
index ceeb474eff49392f986a11743092dc6efadda94e..7d85dc8417dc00730152303faca034e78a1656d1 100644 (file)
--- a/lib/randutils.c
+++ b/lib/randutils.c
@@ -100,7 +100,7 @@ void random_get_bytes(void *buf, size_t nbytes)
 
 #ifdef HAVE_GETRANDOM
        errno = 0;
-       while (getrandom(buf, nbytes, 0) < 0) {
+       while (getrandom(buf, nbytes, 0) != (ssize_t)nbytes) {
                if (errno == EINTR)
                        continue;
                break;