From: Robert Luberda <robert@debian.org>
Date: Sat, 19 Nov 2016 08:48:08 +0100
Subject: Fix nullptr dereference (CVE-2016-9296)

Patch taken from https://sourceforge.net/p/p7zip/bugs/185/
This patch file taken from Debian's patch set for p7zip
---
 CPP/7zip/Archive/7z/7zIn.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/CPP/7zip/Archive/7z/7zIn.cpp b/CPP/7zip/Archive/7z/7zIn.cpp
index b0c6b98..7c6dde2 100644
--- a/CPP/7zip/Archive/7z/7zIn.cpp
+++ b/CPP/7zip/Archive/7z/7zIn.cpp
@@ -1097,7 +1097,8 @@ HRESULT CInArchive::ReadAndDecodePackedStreams(
       if (CrcCalc(data, unpackSize) != folders.FolderCRCs.Vals[i])
         ThrowIncorrect();
   }
-  HeadersSize += folders.PackPositions[folders.NumPackStreams];
+  if (folders.PackPositions)
+      HeadersSize += folders.PackPositions[folders.NumPackStreams];
   return S_OK;
 }
 
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<tr><td><span title='2022-12-10 14:34:35 +0100'>2022-12-10</span></td><td><a href='/guix/commit/gnu/build/install.scm?id=61b7e9687757aff013b99e4ab15669a950c8b222'>install: 'umount-cow-store' retries upon EBUSY.</a><span class='msg-avail'>...<span class='msg-tooltip'>Possibly fixes &lt;https://issues.guix.gnu.org/59884&gt;.

* gnu/build/install.scm (umount*): New procedure.
(unmount-cow-store): Use it instead of 'umount'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-11-15 14:15:11 -0500'>2022-11-15</span></td><td><a href='/guix/commit/gnu/build/install.scm?id=0bb872b379a98e4523c8f8d946e581bad1c4c323'>install: Validate symlink target in evaluate-populate-directive.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/install.scm (evaluate-populate-directive): By default, error when
the target of a symlink doesn't exist.  Always ensure TARGET ends with "/".
(populate-root-file-system): Call evaluate-populate-directive with
 #:error-on-dangling-symlink #t and add comment.
</span></span></td><td>Maxim Cournoyer</td></tr>