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.

gnu/local.mk

@@ -719,6 +719,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/libmad-frame-length.patch		\
   %D%/packages/patches/libmad-mips-newgcc.patch			\
   %D%/packages/patches/libsndfile-armhf-type-checks.patch	\
+  %D%/packages/patches/libsndfile-CVE-2017-8361-8363-8365.patch	\
+  %D%/packages/patches/libsndfile-CVE-2017-8362.patch		\
   %D%/packages/patches/libssh2-fix-build-failure-with-gcrypt.patch	\
   %D%/packages/patches/libtar-CVE-2013-4420.patch \
   %D%/packages/patches/libtheora-config-guess.patch		\

gnu/packages/patches/libsndfile-CVE-2017-8361-8363-8365.patch

@@ -0,0 +1,77 @@
+Fix CVE-2017-{8361,8363,8365}:
+
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8361
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8363
+https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8365
+
+Patch copied from upstream source repository:
+
+https://github.com/erikd/libsndfile/commit/fd0484aba8e51d16af1e3a880f9b8b857b385eb3
+
+From fd0484aba8e51d16af1e3a880f9b8b857b385eb3 Mon Sep 17 00:00:00 2001
+From: Erik de Castro Lopo <erikd@mega-nerd.com>
+Date: Wed, 12 Apr 2017 19:45:30 +1000
+Subject: [PATCH] FLAC: Fix a buffer read overrun
+
+Buffer read overrun occurs when reading a FLAC file that switches
+from 2 channels to one channel mid-stream. Only option is to
+abort the read.
+
+Closes: https://github.com/erikd/libsndfile/issues/230
+---
+ src/common.h  |  1 +
+ src/flac.c    | 13 +++++++++++++
+ src/sndfile.c |  1 +
+ 3 files changed, 15 insertions(+)
+
+diff --git a/src/common.h b/src/common.h
+index 0bd810c3..e2669b6a 100644
+--- a/src/common.h
++++ b/src/common.h
+@@ -725,6 +725,7 @@ enum
+ 	SFE_FLAC_INIT_DECODER,
+ 	SFE_FLAC_LOST_SYNC,
+ 	SFE_FLAC_BAD_SAMPLE_RATE,
++	SFE_FLAC_CHANNEL_COUNT_CHANGED,
+ 	SFE_FLAC_UNKOWN_ERROR,
+ 
+ 	SFE_WVE_NOT_WVE,
+diff --git a/src/flac.c b/src/flac.c
+index 84de0e26..986a7b8f 100644
+--- a/src/flac.c
++++ b/src/flac.c
+@@ -434,6 +434,19 @@ sf_flac_meta_callback (const FLAC__StreamDecoder * UNUSED (decoder), const FLAC_
+ 
+ 	switch (metadata->type)
+ 	{	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" ,
++									psf->sf.channels, metadata->data.stream_info.channels) ;
++				psf->error = SFE_FLAC_CHANNEL_COUNT_CHANGED ;
++				return ;
++				} ;
++
++			if (psf->sf.channels > 0 && psf->sf.samplerate != (int) metadata->data.stream_info.sample_rate)
++			{	psf_log_printf (psf, "Warning: FLAC stream changed sample rates from %d to %d.\n"
++									"Carrying on as if nothing happened.",
++									psf->sf.samplerate, metadata->data.stream_info.sample_rate) ;
++				} ;
+ 			psf->sf.channels = metadata->data.stream_info.channels ;
+ 			psf->sf.samplerate = metadata->data.stream_info.sample_rate ;
+ 			psf->sf.frames = metadata->data.stream_info.total_samples ;
+diff --git a/src/sndfile.c b/src/sndfile.c
+index 41875610..e2a87be8 100644
+--- a/src/sndfile.c
++++ b/src/sndfile.c
+@@ -245,6 +245,7 @@ ErrorStruct SndfileErrors [] =
+ 	{	SFE_FLAC_INIT_DECODER	, "Error : problem with initialization of the flac decoder." },
+ 	{	SFE_FLAC_LOST_SYNC		, "Error : flac decoder lost sync." },
+ 	{	SFE_FLAC_BAD_SAMPLE_RATE, "Error : flac does not support this sample rate." },
++	{	SFE_FLAC_CHANNEL_COUNT_CHANGED, "Error : flac channel changed mid stream." },
+ 	{	SFE_FLAC_UNKOWN_ERROR	, "Error : unknown error in flac decoder." },
+ 
+ 	{	SFE_WVE_NOT_WVE			, "Error : not a WVE file." },
+-- 
+2.12.2
+

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
+

gnu/packages/pulseaudio.scm

@@ -45,6 +45,7 @@
 (define-public libsndfile
   (package
     (name "libsndfile")
+    (replacement libsndfile/fixed)
     (version "1.0.28")
     (source (origin
              (method url-fetch)
@@ -76,6 +77,18 @@ SPARC.  Hopefully the design of the library will also make it easy to extend
 for reading and writing new sound file formats.")
     (license l:gpl2+)))
 
+(define libsndfile/fixed
+  (package
+    (inherit libsndfile)
+    (source
+      (origin
+        (inherit (package-source libsndfile))
+        (patches
+          (append
+            (origin-patches (package-source libsndfile))
+            (search-patches "libsndfile-CVE-2017-8361-8363-8365.patch"
+                            "libsndfile-CVE-2017-8362.patch")))))))
+
 (define-public libsamplerate
   (package
     (name "libsamplerate")                     ; aka. Secret Rabbit Code (SRC)