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-rw-r--r--src/tls/tls_drv.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/tls/tls_drv.c b/src/tls/tls_drv.c
index d0774684..6dbdccbe 100644
--- a/src/tls/tls_drv.c
+++ b/src/tls/tls_drv.c
@@ -443,6 +443,8 @@ static ErlDrvSSizeT tls_drv_control(ErlDrvData handle,
b = driver_alloc_binary(size);
b->orig_bytes[0] = 0;
+ res = 0;
+
while ((req_size == 0 || rlen < req_size + 1) &&
(res = SSL_read(d->ssl,
b->orig_bytes + rlen,