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]));
     }
a034a6d33c8'>refs</a><a class='active' href='/guix/log/tests/keys'>log</a><a href='/guix/tree/tests/keys?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8'>tree</a><a href='/guix/commit/tests/keys?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8'>commit</a><a href='/guix/diff/tests/keys?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/keys'>
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<div class='path'>path: <a href='/guix/log/?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8'>root</a>/<a href='/guix/log/tests?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8'>tests</a>/<a href='/guix/log/tests/keys?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8'>keys</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/tests/keys?id=b41ff1a00d551e211c31a9530b7c9a034a6d33c8&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-05-18 23:20:21 +0200'>2022-05-18</span></td><td><a href='/guix/commit/tests/keys?id=3ae7632ca0a1edca9d8c3c766efb0dcc8aa5da37'>tests: Ensure test OpenPGP keys never expire.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-12-22 10:53:19 +0100'>2021-12-22</span></td><td><a href='/guix/commit/tests/keys?id=9ebc9ca070a21ba0aeb3f61202a8071bb250ccc8'>tests: Move keys into ./tests/keys/ and add a third ed25519 key.</a><span class='msg-avail'>...</span></td><td>Attila Lendvai</td></tr>