gnu: libsndfile: Fix CVE-2017-{8361,8362,8363,8365}.

* gnu/packages/patches/libsndfile-CVE-2017-8361-8363-8365.patch,
gnu/packages/patches/libsndfile-CVE-2017-8362.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/pulseaudio.scm (libsndfile)[replacement]: New field.
(libsndfile/fixed): New variable.

1 files changed, 61 insertions, 0 deletions

diff --git a/gnu/packages/patches/libsndfile-CVE-2017-8362.patch b/gnu/packages/patches/libsndfile-CVE-2017-8362.patch
new file mode 100644
index 0000000000..5fc52a377a
--- /dev/null
+++ b/gnu/packages/patches/libsndfile-CVE-2017-8362.patch
@@ -0,0 +1,61 @@
+Fix CVE-2017-8362:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8362
+
+Patch copied from upstream source repository:
+
+https://github.com/erikd/libsndfile/commit/ef1dbb2df1c0e741486646de40bd638a9c4cd808
+
+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
+---
+ src/flac.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+diff --git a/src/flac.c b/src/flac.c
+index 5a4f8c21..e4f9aaa0 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 ;
+-- 
+2.12.2
+