audiofile: fix multiple CVEs

CVE-2017-6830 / CVE-2017-6834 / CVE-2017-6836 / CVE-2017-6838

Use patch from buildroot:
https://github.com/buildroot/buildroot/commit/4a1a8277bba490d227f413e218138e39f1fe1203

Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/meta-oe/recipes-multimedia/audiofile/audiofile_0.3.6.bb b/meta-oe/recipes-multimedia/audiofile/audiofile_0.3.6.bb
index 67c1992cc4..66194fdc8b 100644
--- a/meta-oe/recipes-multimedia/audiofile/audiofile_0.3.6.bb
+++ b/meta-oe/recipes-multimedia/audiofile/audiofile_0.3.6.bb
@@ -15,6 +15,7 @@ SRC_URI = " \
     file://0003-fix-CVE-2015-7747.patch \
     file://0004-Always-check-the-number-of-coefficients.patch \
     file://0005-clamp-index-values-to-fix-index-overflow-in-IMA.cpp.patch \
+    file://0006-Check-for-multiplication-overflow-in-sfconvert.patch \
 "
 SRC_URI[sha256sum] = "ea2449ad3f201ec590d811db9da6d02ffc5e87a677d06b92ab15363d8cb59782"
 
diff --git a/meta-oe/recipes-multimedia/audiofile/files/0006-Check-for-multiplication-overflow-in-sfconvert.patch b/meta-oe/recipes-multimedia/audiofile/files/0006-Check-for-multiplication-overflow-in-sfconvert.patch
new file mode 100644
index 0000000000..ec21b09f30
--- /dev/null
+++ b/meta-oe/recipes-multimedia/audiofile/files/0006-Check-for-multiplication-overflow-in-sfconvert.patch
@@ -0,0 +1,79 @@
+From 7d65f89defb092b63bcbc5d98349fb222ca73b3c Mon Sep 17 00:00:00 2001
+From: Antonio Larrosa <larrosa@kde.org>
+Date: Mon, 6 Mar 2017 13:54:52 +0100
+Subject: [PATCH] Check for multiplication overflow in sfconvert
+
+Checks that a multiplication doesn't overflow when
+calculating the buffer size, and if it overflows,
+reduce the buffer size instead of failing.
+
+This fixes the 00192-audiofile-signintoverflow-sfconvert case
+in #41
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+
+CVE: CVE-2017-6830
+CVE: CVE-2017-6834
+CVE: CVE-2017-6836
+CVE: CVE-2017-6838
+Upstream-Status: Inactive-Upstream [lastrelease: 2013]
+Signed-off-by: Peter Marko <peter.marko@siemens.com>
+---
+ sfcommands/sfconvert.c | 34 ++++++++++++++++++++++++++++++++--
+ 1 file changed, 32 insertions(+), 2 deletions(-)
+
+diff --git a/sfcommands/sfconvert.c b/sfcommands/sfconvert.c
+index 80a1bc4..970a3e4 100644
+--- a/sfcommands/sfconvert.c
++++ b/sfcommands/sfconvert.c
+@@ -45,6 +45,33 @@ void printusage (void);
+ void usageerror (void);
+ bool copyaudiodata (AFfilehandle infile, AFfilehandle outfile, int trackid);
+ 
++int firstBitSet(int x)
++{
++        int position=0;
++        while (x!=0)
++        {
++                x>>=1;
++                ++position;
++        }
++        return position;
++}
++
++#ifndef __has_builtin
++#define __has_builtin(x) 0
++#endif
++
++int multiplyCheckOverflow(int a, int b, int *result)
++{
++#if (defined __GNUC__ && __GNUC__ >= 5) || ( __clang__ && __has_builtin(__builtin_mul_overflow))
++       return __builtin_mul_overflow(a, b, result);
++#else
++       if (firstBitSet(a)+firstBitSet(b)>31) // int is signed, so we can't use 32 bits
++               return true;
++       *result = a * b;
++       return false;
++#endif
++}
++
+ int main (int argc, char **argv)
+ {
+        if (argc == 2)
+@@ -323,8 +350,11 @@ bool copyaudiodata (AFfilehandle infile, AFfilehandle outfile, int trackid)
+ {
+        int frameSize = afGetVirtualFrameSize(infile, trackid, 1);
+ 
+-       const int kBufferFrameCount = 65536;
+-       void *buffer = malloc(kBufferFrameCount * frameSize);
++       int kBufferFrameCount = 65536;
++       int bufferSize;
++       while (multiplyCheckOverflow(kBufferFrameCount, frameSize, &bufferSize))
++               kBufferFrameCount /= 2;
++       void *buffer = malloc(bufferSize);
+ 
+        AFframecount totalFrames = afGetFrameCount(infile, AF_DEFAULT_TRACK);
+        AFframecount totalFramesWritten = 0;
+-- 
+2.11.0
+