libsndfile1: Fix CVE-2017-8362

Backport the patch to fix CVE-2017-8362:

The flac_buffer_copy function in flac.c in libsndfile 1.0.28 allows
remote attackers to cause a denial of service (invalid read and
application crash) via a crafted audio file.

Reference:
https://nvd.nist.gov/vuln/detail/CVE-2017-8362

(From OE-Core rev: 0c8da3f6f85962196f2ad54fffd839239f5c2274)

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 60 insertions, 0 deletions

diff --git a/meta/recipes-multimedia/libsndfile/libsndfile1/CVE-2017-8362.patch b/meta/recipes-multimedia/libsndfile/libsndfile1/CVE-2017-8362.patch
new file mode 100644
index 0000000000..9ee7e46a6d
--- /dev/null
+++ b/meta/recipes-multimedia/libsndfile/libsndfile1/CVE-2017-8362.patch
@@ -0,0 +1,59 @@
+From ef1dbb2df1c0e741486646de40bd638a9c4cd808 Mon Sep 17 00:00:00 2001
+From: Erik de Castro Lopo <erikd@mega-nerd.com>
+Date: Fri, 14 Apr 2017 15:19:16 +1000
+Subject: [PATCH] src/flac.c: Fix a buffer read overflow
+
+A file (generated by a fuzzer) which increased the number of channels
+from one frame to the next could cause a read beyond the end of the
+buffer provided by libFLAC. Only option is to abort the read.
+
+Closes: https://github.com/erikd/libsndfile/issues/231
+
+CVE: CVE-2017-8362
+
+Upstream-Status: Backport [https://github.com/erikd/libsndfile/commit/ef1dbb2df1c0e741486646de40bd638a9c4cd808]
+
+Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
+---
+ src/flac.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+diff --git a/src/flac.c b/src/flac.c
+index 5a4f8c2..e4f9aaa 100644
+--- a/src/flac.c
++++ b/src/flac.c
+@@ -169,6 +169,14 @@ flac_buffer_copy (SF_PRIVATE *psf)
+        const int32_t* const *buffer = pflac->wbuffer ;
+        unsigned i = 0, j, offset, channels, len ;
+ 
++       if (psf->sf.channels != (int) frame->header.channels)
++       {       psf_log_printf (psf, "Error: FLAC frame changed from %d to %d channels\n"
++                                                                       "Nothing to do but to error out.\n" ,
++                                                                       psf->sf.channels, frame->header.channels) ;
++               psf->error = SFE_FLAC_CHANNEL_COUNT_CHANGED ;
++               return 0 ;
++               } ;
++
+        /*
+        **      frame->header.blocksize is variable and we're using a constant blocksize
+        **      of FLAC__MAX_BLOCK_SIZE.
+@@ -202,7 +210,6 @@ flac_buffer_copy (SF_PRIVATE *psf)
+                return 0 ;
+                } ;
+ 
+-
+        len = SF_MIN (pflac->len, frame->header.blocksize) ;
+ 
+        if (pflac->remain % channels != 0)
+@@ -436,7 +443,7 @@ sf_flac_meta_callback (const FLAC__StreamDecoder * UNUSED (decoder), const FLAC_
+        {       case FLAC__METADATA_TYPE_STREAMINFO :
+                        if (psf->sf.channels > 0 && psf->sf.channels != (int) metadata->data.stream_info.channels)
+                        {       psf_log_printf (psf, "Error: FLAC stream changed from %d to %d channels\n"
+-                                                                       "Nothing to be but to error out.\n" ,
++                                                                       "Nothing to do but to error out.\n" ,
+                                                                        psf->sf.channels, metadata->data.stream_info.channels) ;
+                                psf->error = SFE_FLAC_CHANNEL_COUNT_CHANGED ;
+                                return ;
+-- 
+2.7.4
+
diff --git a/meta/recipes-multimedia/libsndfile/libsndfile1_1.0.28.bb b/meta/recipes-multimedia/libsndfile/libsndfile1_1.0.28.bb
index f80ce2fc99..2bd51b1cd9 100644
--- a/meta/recipes-multimedia/libsndfile/libsndfile1_1.0.28.bb
+++ b/meta/recipes-multimedia/libsndfile/libsndfile1_1.0.28.bb
@@ -8,6 +8,7 @@ LICENSE = "LGPLv2.1"
 SRC_URI = "http://www.mega-nerd.com/libsndfile/files/libsndfile-${PV}.tar.gz \
            file://CVE-2017-6892.patch \
            file://CVE-2017-8361-8365.patch \
+           file://CVE-2017-8362.patch \
           "
 
 SRC_URI[md5sum] = "646b5f98ce89ac60cdb060fcd398247c"