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-rw-r--r--gnu/packages/patches/audiofile-fix-sign-conversion.patch26
1 files changed, 26 insertions, 0 deletions
diff --git a/gnu/packages/patches/audiofile-fix-sign-conversion.patch b/gnu/packages/patches/audiofile-fix-sign-conversion.patch
new file mode 100644
index 0000000000..648161d620
--- /dev/null
+++ b/gnu/packages/patches/audiofile-fix-sign-conversion.patch
@@ -0,0 +1,26 @@
+Based on (hunk for changelog removed)
+From b62c902dd258125cac86cd2df21fc898035a43d3 Mon Sep 17 00:00:00 2001
+From: Michael Pruett <michael@68k.org>
+Date: Mon, 29 Aug 2016 23:08:26 -0500
+Subject: [PATCH] Fix undefined behavior in sign conversion.
+
+
+---
+ ChangeLog | 5 +++++
+ libaudiofile/modules/SimpleModule.h | 3 ++-
+ 2 files changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/libaudiofile/modules/SimpleModule.h b/libaudiofile/modules/SimpleModule.h
+index 03c6c69..bad85ad 100644
+--- a/libaudiofile/modules/SimpleModule.h
++++ b/libaudiofile/modules/SimpleModule.h
+@@ -123,7 +123,8 @@ struct signConverter
+ typedef typename IntTypes<Format>::UnsignedType UnsignedType;
+
+ static const int kScaleBits = (Format + 1) * CHAR_BIT - 1;
+- static const int kMinSignedValue = -1 << kScaleBits;
++ static const int kMaxSignedValue = (((1 << (kScaleBits - 1)) - 1) << 1) + 1;
++ static const int kMinSignedValue = -kMaxSignedValue - 1;
+
+ struct signedToUnsigned : public std::unary_function<SignedType, UnsignedType>
+ {