From 4f4a0acd962a825b90a86e538ada0166b6d71cb7 Mon Sep 17 00:00:00 2001
From: Tomas Mraz <tomas@openssl.org>
Date: Tue, 24 Oct 2023 09:27:23 +0200
Subject: [PATCH] Allow short reads in asn1_d2i_read_bio()

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/22486)

(cherry picked from commit 202ef97edc8e5561a6f4db28919d5ed73d411cc7)
---
 crypto/asn1/a_d2i_fp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crypto/asn1/a_d2i_fp.c b/crypto/asn1/a_d2i_fp.c
index e8602053f974f..833dc104ddcfc 100644
--- a/crypto/asn1/a_d2i_fp.c
+++ b/crypto/asn1/a_d2i_fp.c
@@ -148,6 +148,9 @@ int asn1_d2i_read_bio(BIO *in, BUF_MEM **pb)
                     goto err;
                 }
                 len += i;
+                if ((size_t)i < want)
+                    continue;
+
             }
         }
         /* else data already loaded */