Copied from Fedora.

http://pkgs.fedoraproject.org/cgit/unzip.git/tree/unzip-6.0-heap-overflow-infloop.patch?id=d18f821e

From bdd4a0cecd745cb4825e4508b5bdf2579731086a Mon Sep 17 00:00:00 2001
From: Petr Stodulka <pstodulk@redhat.com>
Date: Mon, 14 Sep 2015 18:23:17 +0200
Subject: [PATCH 1/3] upstream fix for heap overflow

https://bugzilla.redhat.com/attachment.cgi?id=1073002
---
 crypt.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/crypt.c b/crypt.c
index 784e411..a8975f2 100644
--- a/crypt.c
+++ b/crypt.c
@@ -465,7 +465,17 @@ int decrypt(__G__ passwrd)
     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]));
     }
-- 
2.4.6


From 4b48844661ff9569f2ecf582a387d46a5775b5d8 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Mon, 14 Sep 2015 18:24:56 +0200
Subject: [PATCH 2/3] fix infinite loop when extracting empty bzip2 data

Bug: https://sourceforge.net/p/infozip/patches/23/
---
 extract.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/extract.c b/extract.c
index 7134bfe..29db027 100644
--- a/extract.c
+++ b/extract.c
@@ -2733,6 +2733,12 @@ __GDEF
     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;
-- 
2.4.6


From bd150334fb4084f5555a6be26b015a0671cb5b74 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Tue, 22 Sep 2015 18:52:23 +0200
Subject: [PATCH 3/3] extract: prevent unsigned overflow on invalid input

Suggested-by: Stefan Cornelius
---
 extract.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/extract.c b/extract.c
index 29db027..b9ae667 100644
--- a/extract.c
+++ b/extract.c
@@ -1257,8 +1257,17 @@ static int extract_or_test_entrylist(__G__ numchunk,
         if (G.lrec.compression_method == STORED) {
             zusz_t csiz_decrypted = G.lrec.csize;
 
-            if (G.pInfo->encrypted)
+            if (G.pInfo->encrypted) {
+                if (csiz_decrypted <= 12) {
+                    /* handle the error now to prevent unsigned overflow */
+                    Info(slide, 0x401, ((char *)slide,
+                      LoadFarStringSmall(ErrUnzipNoFile),
+                      LoadFarString(InvalidComprData),
+                      LoadFarStringSmall2(Inflate)));
+                    return PK_ERR;
+                }
                 csiz_decrypted -= 12;
+            }
             if (G.lrec.ucsize != csiz_decrypted) {
                 Info(slide, 0x401, ((char *)slide,
                   LoadFarStringSmall2(WrnStorUCSizCSizDiff),
-- 
2.5.2

