Original source:

https://trac.xiph.org/attachment/ticket/2212/0001-oggenc-Fix-large-alloca-on-bad-AIFF-input.patch

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

--- oggenc/audio.c

+++ 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