From dc92574c10f3e2516ec6445b88c5d584f40df4e5 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Mon, 4 Jan 2021 11:55:28 -0500
Subject: Fix some pipelines to be safe if downstream write fails (fuzz issue
 28262)

---
 libqpdf/Pl_ASCII85Decoder.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'libqpdf/Pl_ASCII85Decoder.cc')

diff --git a/libqpdf/Pl_ASCII85Decoder.cc b/libqpdf/Pl_ASCII85Decoder.cc
index b8df3e87..9d9f6704 100644
--- a/libqpdf/Pl_ASCII85Decoder.cc
+++ b/libqpdf/Pl_ASCII85Decoder.cc
@@ -119,10 +119,13 @@ Pl_ASCII85Decoder::flush()
 
     QTC::TC("libtests", "Pl_ASCII85Decoder partial flush",
 	    (this->pos == 5) ? 0 : 1);
-    getNext()->write(outbuf, this->pos - 1);
-
+    // Reset before calling getNext()->write in case that throws an
+    // exception.
+    auto t = this->pos - 1;
     this->pos = 0;
     memset(this->inbuf, 117, 5);
+
+    getNext()->write(outbuf, t);
 }
 
 void
-- 
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