Upstream fix for CVE-2015-6749.
https://trac.xiph.org/ticket/2212

From 04815d3e1bfae3a6cdfb2c25358a5a72b61299f7 Mon Sep 17 00:00:00 2001
From: Mark Harris <mark.hsj@gmail.com>
Date: Sun, 30 Aug 2015 05:54:46 -0700
Subject: [PATCH] oggenc: Fix large alloca on bad AIFF input

Fixes #2212
---
 oggenc/audio.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/oggenc/audio.c b/oggenc/audio.c
index 477da8c..4921fb9 100644
--- a/oggenc/audio.c
+++ b/oggenc/audio.c
@@ -245,8 +245,8 @@ static int aiff_permute_matrix[6][6] =
 int aiff_open(FILE *in, oe_enc_opt *opt, unsigned char *buf, int buflen)
 {
     int aifc; /* AIFC or AIFF? */
-    unsigned int len;
-    unsigned char *buffer;
+    unsigned int len, readlen;
+    unsigned char buffer[22];
     unsigned char buf2[8];
     aiff_fmt format;
     aifffile *aiff = malloc(sizeof(aifffile));
@@ -269,9 +269,9 @@ int aiff_open(FILE *in, oe_enc_opt *opt, unsigned char *buf, int buflen)
         return 0; /* Weird common chunk */
     }
 
-    buffer = alloca(len);
-
-    if(fread(buffer,1,len,in) < len)
+    readlen = len < sizeof(buffer) ? len : sizeof(buffer);
+    if(fread(buffer,1,readlen,in) < readlen ||
+       (len > readlen && !seek_forward(in, len-readlen)))
     {
         fprintf(stderr, _("Warning: Unexpected EOF in reading AIFF header\n"));
         return 0;
-- 
2.5.0

.scm?id=90b89aeb775ad8566fbe3a5a03a7f77abd264058'>commit</a><a href='/guix/diff/tests/git-authenticate.scm?id=90b89aeb775ad8566fbe3a5a03a7f77abd264058'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/git-authenticate.scm'>
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<div class='path'>path: <a href='/guix/log/?id=90b89aeb775ad8566fbe3a5a03a7f77abd264058'>root</a>/<a href='/guix/log/tests?id=90b89aeb775ad8566fbe3a5a03a7f77abd264058'>tests</a>/<a href='/guix/log/tests/git-authenticate.scm?id=90b89aeb775ad8566fbe3a5a03a7f77abd264058'>git-authenticate.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/tests/git-authenticate.scm?id=90b89aeb775ad8566fbe3a5a03a7f77abd264058&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-06-28 23:26:53 +0200'>2020-06-28</span></td><td><a href='/guix/commit/tests/git-authenticate.scm?id=0a8dd8aae5fad365c2f429d48e4085a3b3388332'>tests: Allow 'tests/git-authenticate.scm' to run when git/gpg is missing.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-20 13:18:11 +0200'>2020-06-20</span></td><td><a href='/guix/commit/tests/git-authenticate.scm?id=7b06781a58326f251c4af6340379d68e3cb98adb'>tests: Skip tests that requires gpg when gpg is unavailable.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-16 16:10:46 +0200'>2020-06-16</span></td><td><a href='/guix/commit/tests/git-authenticate.scm?id=1e2b9bf2d4ed4edc9ed70c51f414bb2890074a21'>tests: Move OpenPGP helpers to (guix tests gnupg).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-12 18:56:11 +0200'>2020-06-12</span></td><td><a href='/guix/commit/tests/git-authenticate.scm?id=52c529ff20b389eb64ac033586e6b1a5c5d82cb5'>git-authenticate: Disallow SHA1 (and MD5) signatures.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-07 23:10:46 +0200'>2020-06-07</span></td><td><a href='/guix/commit/tests/git-authenticate.scm?id=e78275608065ef073775fabb9f1a757da65851f2'>git-authenticate: Prevent removal of '.guix-authorizations'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-06-05 22:54:06 +0200'>2020-06-05</span></td><td><a href='/guix/commit/tests/git-authenticate.scm?id=c83eedba2361c3831d3efb5ad63d5077d636fb28'>git-authenticate: Add tests.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>