From: A. Wilcox <AWilcox@Wilcox-Tech.com>
Date: Mon, 3 Jun 2019 05:16:30 +0000 (-0500)
Subject: multilineedit: handle unterminated mIRC codes
X-Git-Tag: test-travis-01~10
X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=commitdiff_plain;h=b359cfe9fdd2427993dc0b2f3f605fd69bbe6bd2

multilineedit: handle unterminated mIRC codes

Currently, if an unterminated mIRC code is pasted into Quassel, trying to
go through input line history will cause a deadlock.  This breaks the loop
at the cost of possibly mangling the formatting of the line somewhat.
This is seen as more acceptable than locking up, and the line is invalid
anyway.

Reproducer:

```sh
printf '\00303,08HONK' | xclip -selection clipboard
```

Paste into Quassel, send, press Up arrow key.

Bug originally found by @sroracle, reported to Adélie Linux, patched by
yours truly.
---

diff --git a/src/uisupport/multilineedit.cpp b/src/uisupport/multilineedit.cpp
index 166e12cc..a9a2ae24 100644
--- a/src/uisupport/multilineedit.cpp
+++ b/src/uisupport/multilineedit.cpp
@@ -601,6 +601,10 @@ QString MultiLineEdit::convertMircCodesToHtml(const QString& text)
         }
 
         posRight = text.indexOf(mircCode.cap(), posRight + 1);
+        if (posRight == -1) {
+            words << text.mid(posLeft);
+            break;  // unclosed color code; can't process
+        }
         words << text.mid(posLeft, posRight + 1 - posLeft);
         posLeft = posRight + 1;
     }