Copied from Debian.

From: Petr Stodulka <pstodulk@redhat.com>
Date: Mon, 14 Sep 2015 18:23:17 +0200
Subject: Upstream fix for heap overflow
Bug-Debian: https://bugs.debian.org/802162
Bug-RedHat: https://bugzilla.redhat.com/show_bug.cgi?id=1260944
Origin: https://bugzilla.redhat.com/attachment.cgi?id=1073002
Forwarded: yes

---
 crypt.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

--- a/crypt.c
+++ b/crypt.c
@@ -465,7 +465,17 @@
     GLOBAL(pInfo->encrypted) = FALSE;
     defer_leftover_input(__G);
     for (n = 0; n < RAND_HEAD_LEN; n++) {
-        b = NEXTBYTE;
+        /* 2012-11-23 SMS.  (OUSPG report.)
+         * Quit early if compressed size < HEAD_LEN.  The resulting
+         * error message ("unable to get password") could be improved,
+         * but it's better than trying to read nonexistent data, and
+         * then continuing with a negative G.csize.  (See
+         * fileio.c:readbyte()).
+         */
+        if ((b = NEXTBYTE) == (ush)EOF)
+        {
+            return PK_ERR;
+        }
         h[n] = (uch)b;
         Trace((stdout, " (%02x)", h[n]));
     }
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<div class='path'>path: <a href='/guix/log/?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>root</a>/<a href='/guix/log/gnu?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>gnu</a>/<a href='/guix/log/gnu/packages?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>packages</a>/<a href='/guix/log/gnu/packages/slang.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e'>slang.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/slang.scm?id=b8a6230df3fbbeeddb7a0e6976e0b8581bd0ab6e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-11-07 18:39:19 +0900'>2018-11-07</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=8243f4e55a9f87821370eb2198fa9b5c8eac6648'>gnu: slang: Use a correct location for terminfo dirs.</a><span class='msg-avail'>...</span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2018-08-28 01:19:28 +0200'>2018-08-28</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=eb87b634a7723111bdbc84f1971fe64bc96a8963'>gnu: slang: Update to 2.3.2.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-03-16 09:08:31 -0400'>2018-03-16</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=6cbee49d6668eb7fd738080666f66febfce8c7e8'>gnu: All snippets report errors using exceptions, else return #t.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2018-02-21 15:02:47 +0100'>2018-02-21</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=61faf24df66bdade0ec780d4a5e5e3d461329341'>gnu: slang: Update to 2.3.1a.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-01-21 20:40:29 +0100'>2018-01-21</span></td><td><a href='/guix/commit/gnu/packages/slang.scm?id=982dab0ba73a8556bb5ab65bf199efbd1f2b508b'>gnu: newt: Update to 0.52.20.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>