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='2021-06-24 18:19:39 -0400'>2021-06-24</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=1bf1226a4fe12d65a95792ec4f74b86b5ed26221'>services: certbot: Add option to use CSR file.</a><span class='msg-avail'>...</span></td><td>Raghav Gururajan</td></tr>
<tr><td><span title='2020-09-13 23:34:23 +0200'>2020-09-13</span></td><td><a href='/guix/commit/gnu/services/certbot.scm?id=11a962e6536d59b8c5b24880fbb19550242ffa04'>services: certbot: Support registration without email.</a><span class='msg-avail'>...</span></td><td>Timotej Lazar</td></tr>