Remove mention of a refcount bug

Said bug was fixed in OpenSSL 1.0.0, released 14 years ago. It is of course
unsurprising that you may accidentally increment the refcount if your idiom
for decrementing it is CRYPTO_add(&bio-references, -1, CRYPTO_LOCK_BIO)).

diff --git a/lib/libssl/man/BIO_f_ssl.3 b/lib/libssl/man/BIO_f_ssl.3
index 5d72def..3b74a3d 100644 (file)
--- a/lib/libssl/man/BIO_f_ssl.3
+++ b/lib/libssl/man/BIO_f_ssl.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: BIO_f_ssl.3,v 1.15 2024/01/13 17:50:01 tb Exp $
+.\" $OpenBSD: BIO_f_ssl.3,v 1.16 2024/01/13 18:37:51 tb Exp $
 .\" full merge up to: OpenSSL f672aee4 Feb 9 11:52:40 2016 -0500
 .\" selective merge up to: OpenSSL 61f805c1 Jan 16 01:01:46 2018 +0800
 .\"
@@ -607,20 +607,3 @@ and
 first appeared in SSLeay 0.9.0.
 All these functions have been available since
 .Ox 2.4 .
-.Pp
-In OpenSSL versions before 1.0.0 the
-.Xr BIO_pop 3
-call was handled incorrectly:
-the I/O BIO reference count was incorrectly incremented (instead of
-decremented) and dissociated with the
-.Vt SSL
-.Vt BIO
-even if the
-.Vt SSL
-.Vt BIO
-was not
-explicitly being popped (e.g., a pop higher up the chain).
-Applications which included workarounds for this bug (e.g., freeing BIOs more
-than once) should be modified to handle this fix or they may free up an already
-freed
-.Vt BIO .