Copied from Debian.

From: Kamil Dudka <kdudka@redhat.com>
Date: Mon, 14 Sep 2015 18:24:56 +0200
Subject: fix infinite loop when extracting empty bzip2 data
Bug-Debian: https://bugs.debian.org/802160
Bug-RedHat: https://bugzilla.redhat.com/show_bug.cgi?id=1260944
Origin: other, https://bugzilla.redhat.com/attachment.cgi?id=1073339

---
 extract.c | 6 ++++++
 1 file changed, 6 insertions(+)

--- a/extract.c
+++ b/extract.c
@@ -2728,6 +2728,12 @@
     int repeated_buf_err;
     bz_stream bstrm;
 
+    if (G.incnt <= 0 && G.csize <= 0L) {
+        /* avoid an infinite loop */
+        Trace((stderr, "UZbunzip2() got empty input\n"));
+        return 2;
+    }
+
 #if (defined(DLL) && !defined(NO_SLIDE_REDIR))
     if (G.redirect_slide)
         wsize = G.redirect_size, redirSlide = G.redirect_buffer;
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<tr><td><span title='2019-02-05 22:33:06 +0100'>2019-02-05</span></td><td><a href='/guix/commit/tests/opam.scm?id=0f4432c620f8d569ef29ca74bad2b7eebd803441'>import: opam: Fix conditions.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-12-17 21:43:51 +0100'>2018-12-17</span></td><td><a href='/guix/commit/tests/opam.scm?id=cce654fabdf09cac7d18f9bad842ba8445aa022c'>import: Update opam importer.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2018-09-04 17:25:11 +0200'>2018-09-04</span></td><td><a href='/guix/commit/tests/opam.scm?id=ca719424455465fca4b872c371daf2a46de88b33'>Switch to Guile-Gcrypt.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-07-10 10:11:01 +0200'>2018-07-10</span></td><td><a href='/guix/commit/tests/opam.scm?id=b24443bff9f9f3f36353eea2ef35e6dc3745a417'>guix: Add opam importer.</a><span class='msg-avail'>...</span></td><td>Julien Lepiller</td></tr>