Fix BIO_eof() for BIO pairs

BIO_eof() was always returning true when using a BIO pair. It should only
be true if the peer BIO is empty and has been shutdown.

RT#1215

Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 3105d695358d86c0f2a404b2b74a1870b941ce5e)

1 files changed, 7 insertions, 8 deletions

diff --git a/crypto/bio/bss_bio.c b/crypto/bio/bss_bio.c
index 4d8727f8f8..202cc3615d 100644
--- a/crypto/bio/bss_bio.c
+++ b/crypto/bio/bss_bio.c
@@ -655,16 +655,15 @@ static long bio_ctrl(BIO *bio, int cmd, long num, void *ptr)
         break;
 
     case BIO_CTRL_EOF:
-        {
-            BIO *other_bio = ptr;
-
-            if (other_bio) {
-                struct bio_bio_st *other_b = other_bio->ptr;
+        if (b->peer != NULL) {
+            struct bio_bio_st *peer_b = b->peer->ptr;
 
-                assert(other_b != NULL);
-                ret = other_b->len == 0 && other_b->closed;
-            } else
+            if (peer_b->len == 0 && peer_b->closed)
                 ret = 1;
+            else
+                ret = 0;
+        } else {
+            ret = 1;
         }
         break;