auth/Crypto: assert(len <= 256) before calling getentropy()

this assert() will be optimized out in Release mode. Signed-off-by: Kefu Chai <kchai@redhat.com> (cherry picked from commit ccae47e)
ceph · Oct 31, 2019 · b1d4498 · b1d4498
1 parent 958e43a
commit b1d4498
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/auth/Crypto.cc b/src/auth/Crypto.cc
@@ -70,6 +70,8 @@ void CryptoRandom::get_bytes(char *buf, int len)
   if (unlikely(fd >= 0)) {
     ret = safe_read_exact(fd, buf, len);
   } else {
+    // getentropy() reads up to 256 bytes
+    assert(len <= 256);
     ret = TEMP_FAILURE_RETRY(::getentropy(buf, len));
   }
   if (ret < 0) {