From cc894a184fe266b8d25069077008a8c0f7a3d241 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Fri, 22 Feb 2013 11:28:48 -0800
Subject: [PATCH] Fix variance (signed integer) overflow

based on change made in experimental:
  9847344 Fix variance (signed integer) overflow

Change-Id: I36f4ba5700f6f4615057daf7e70868f68a86669f
---
 vp8/common/variance_c.c         | 10 +++++-----
 vp8/common/x86/variance_mmx.c   | 20 ++++++++++----------
 vp8/common/x86/variance_sse2.c  | 26 +++++++++++++-------------
 vp8/common/x86/variance_ssse3.c |  4 ++--
 4 files changed, 30 insertions(+), 30 deletions(-)

diff --git a/vp8/common/variance_c.c b/vp8/common/variance_c.c
index da08affb8..773b655ef 100644
--- a/vp8/common/variance_c.c
+++ b/vp8/common/variance_c.c
@@ -75,7 +75,7 @@ unsigned int vp8_variance16x16_c(
 
     variance(src_ptr, source_stride, ref_ptr, recon_stride, 16, 16, &var, &avg);
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 8));
+    return (var - (((unsigned int)avg * avg) >> 8));
 }
 
 unsigned int vp8_variance8x16_c(
@@ -91,7 +91,7 @@ unsigned int vp8_variance8x16_c(
 
     variance(src_ptr, source_stride, ref_ptr, recon_stride, 8, 16, &var, &avg);
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 7));
+    return (var - (((unsigned int)avg * avg) >> 7));
 }
 
 unsigned int vp8_variance16x8_c(
@@ -107,7 +107,7 @@ unsigned int vp8_variance16x8_c(
 
     variance(src_ptr, source_stride, ref_ptr, recon_stride, 16, 8, &var, &avg);
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 7));
+    return (var - (((unsigned int)avg * avg) >> 7));
 }
 
 
@@ -124,7 +124,7 @@ unsigned int vp8_variance8x8_c(
 
     variance(src_ptr, source_stride, ref_ptr, recon_stride, 8, 8, &var, &avg);
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 6));
+    return (var - (((unsigned int)avg * avg) >> 6));
 }
 
 unsigned int vp8_variance4x4_c(
@@ -140,7 +140,7 @@ unsigned int vp8_variance4x4_c(
 
     variance(src_ptr, source_stride, ref_ptr, recon_stride, 4, 4, &var, &avg);
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 4));
+    return (var - (((unsigned int)avg * avg) >> 4));
 }
 
 
diff --git a/vp8/common/x86/variance_mmx.c b/vp8/common/x86/variance_mmx.c
index 0c4dd4a98..36995db9a 100644
--- a/vp8/common/x86/variance_mmx.c
+++ b/vp8/common/x86/variance_mmx.c
@@ -91,7 +91,7 @@ unsigned int vp8_variance4x4_mmx(
 
     vp8_get4x4var_mmx(src_ptr, source_stride, ref_ptr, recon_stride, &var, &avg) ;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 4));
+    return (var - (((unsigned int)avg * avg) >> 4));
 
 }
 
@@ -108,7 +108,7 @@ unsigned int vp8_variance8x8_mmx(
     vp8_get8x8var_mmx(src_ptr, source_stride, ref_ptr, recon_stride, &var, &avg) ;
     *sse = var;
 
-    return (var - ((unsigned int)(avg * avg) >> 6));
+    return (var - (((unsigned int)avg * avg) >> 6));
 
 }
 
@@ -153,7 +153,7 @@ unsigned int vp8_variance16x16_mmx(
     var = sse0 + sse1 + sse2 + sse3;
     avg = sum0 + sum1 + sum2 + sum3;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 8));
+    return (var - (((unsigned int)avg * avg) >> 8));
 }
 
 unsigned int vp8_variance16x8_mmx(
@@ -172,7 +172,7 @@ unsigned int vp8_variance16x8_mmx(
     var = sse0 + sse1;
     avg = sum0 + sum1;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 7));
+    return (var - (((unsigned int)avg * avg) >> 7));
 
 }
 
@@ -194,7 +194,7 @@ unsigned int vp8_variance8x16_mmx(
     avg = sum0 + sum1;
     *sse = var;
 
-    return (var - ((unsigned int)(avg * avg) >> 7));
+    return (var - (((unsigned int)avg * avg) >> 7));
 
 }
 
@@ -219,7 +219,7 @@ unsigned int vp8_sub_pixel_variance4x4_mmx
         &xsum, &xxsum
     );
     *sse = xxsum;
-    return (xxsum - ((unsigned int)(xsum * xsum) >> 4));
+    return (xxsum - (((unsigned int)xsum * xsum) >> 4));
 }
 
 
@@ -244,7 +244,7 @@ unsigned int vp8_sub_pixel_variance8x8_mmx
         &xsum, &xxsum
     );
     *sse = xxsum;
-    return (xxsum - ((unsigned int)(xsum * xsum) >> 6));
+    return (xxsum - (((unsigned int)xsum * xsum) >> 6));
 }
 
 unsigned int vp8_sub_pixel_variance16x16_mmx
@@ -282,7 +282,7 @@ unsigned int vp8_sub_pixel_variance16x16_mmx
     xxsum0 += xxsum1;
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 8));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
 
 
 }
@@ -335,7 +335,7 @@ unsigned int vp8_sub_pixel_variance16x8_mmx
     xxsum0 += xxsum1;
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 7));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 7));
 }
 
 unsigned int vp8_sub_pixel_variance8x16_mmx
@@ -358,7 +358,7 @@ unsigned int vp8_sub_pixel_variance8x16_mmx
         &xsum, &xxsum
     );
     *sse = xxsum;
-    return (xxsum - ((unsigned int)(xsum * xsum) >> 7));
+    return (xxsum - (((unsigned int)xsum * xsum) >> 7));
 }
 
 
diff --git a/vp8/common/x86/variance_sse2.c b/vp8/common/x86/variance_sse2.c
index afd642915..7fa5f53dc 100644
--- a/vp8/common/x86/variance_sse2.c
+++ b/vp8/common/x86/variance_sse2.c
@@ -148,7 +148,7 @@ unsigned int vp8_variance4x4_wmt(
 
     vp8_get4x4var_mmx(src_ptr, source_stride, ref_ptr, recon_stride, &var, &avg) ;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 4));
+    return (var - (((unsigned int)avg * avg) >> 4));
 
 }
 
@@ -165,7 +165,7 @@ unsigned int vp8_variance8x8_wmt
 
     vp8_get8x8var_sse2(src_ptr, source_stride, ref_ptr, recon_stride, &var, &avg) ;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 6));
+    return (var - (((unsigned int)avg * avg) >> 6));
 
 }
 
@@ -184,7 +184,7 @@ unsigned int vp8_variance16x16_wmt
 
     vp8_get16x16var_sse2(src_ptr, source_stride, ref_ptr, recon_stride, &sse0, &sum0) ;
     *sse = sse0;
-    return (sse0 - ((unsigned int)(sum0 * sum0) >> 8));
+    return (sse0 - (((unsigned int)sum0 * sum0) >> 8));
 }
 unsigned int vp8_mse16x16_wmt(
     const unsigned char *src_ptr,
@@ -220,7 +220,7 @@ unsigned int vp8_variance16x8_wmt
     var = sse0 + sse1;
     avg = sum0 + sum1;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 7));
+    return (var - (((unsigned int)avg * avg) >> 7));
 
 }
 
@@ -241,7 +241,7 @@ unsigned int vp8_variance8x16_wmt
     var = sse0 + sse1;
     avg = sum0 + sum1;
     *sse = var;
-    return (var - ((unsigned int)(avg * avg) >> 7));
+    return (var - (((unsigned int)avg * avg) >> 7));
 
 }
 
@@ -265,7 +265,7 @@ unsigned int vp8_sub_pixel_variance4x4_wmt
         &xsum, &xxsum
     );
     *sse = xxsum;
-    return (xxsum - ((unsigned int)(xsum * xsum) >> 4));
+    return (xxsum - (((unsigned int)xsum * xsum) >> 4));
 }
 
 
@@ -314,7 +314,7 @@ unsigned int vp8_sub_pixel_variance8x8_wmt
     }
 
     *sse = xxsum;
-    return (xxsum - ((unsigned int)(xsum * xsum) >> 6));
+    return (xxsum - (((unsigned int)xsum * xsum) >> 6));
 }
 
 unsigned int vp8_sub_pixel_variance16x16_wmt
@@ -376,7 +376,7 @@ unsigned int vp8_sub_pixel_variance16x16_wmt
     }
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 8));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
 }
 
 unsigned int vp8_sub_pixel_mse16x16_wmt(
@@ -447,7 +447,7 @@ unsigned int vp8_sub_pixel_variance16x8_wmt
     }
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 7));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 7));
 }
 
 unsigned int vp8_sub_pixel_variance8x16_wmt
@@ -495,7 +495,7 @@ unsigned int vp8_sub_pixel_variance8x16_wmt
     }
 
     *sse = xxsum;
-    return (xxsum - ((unsigned int)(xsum * xsum) >> 7));
+    return (xxsum - (((unsigned int)xsum * xsum) >> 7));
 }
 
 
@@ -515,7 +515,7 @@ unsigned int vp8_variance_halfpixvar16x16_h_wmt(
         &xsum0, &xxsum0);
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 8));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
 }
 
 
@@ -534,7 +534,7 @@ unsigned int vp8_variance_halfpixvar16x16_v_wmt(
         &xsum0, &xxsum0);
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 8));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
 }
 
 
@@ -554,5 +554,5 @@ unsigned int vp8_variance_halfpixvar16x16_hv_wmt(
         &xsum0, &xxsum0);
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 8));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
 }
diff --git a/vp8/common/x86/variance_ssse3.c b/vp8/common/x86/variance_ssse3.c
index ba2055cc9..f90f8117c 100644
--- a/vp8/common/x86/variance_ssse3.c
+++ b/vp8/common/x86/variance_ssse3.c
@@ -113,7 +113,7 @@ unsigned int vp8_sub_pixel_variance16x16_ssse3
     }
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 8));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
 }
 
 unsigned int vp8_sub_pixel_variance16x8_ssse3
@@ -162,5 +162,5 @@ unsigned int vp8_sub_pixel_variance16x8_ssse3
     }
 
     *sse = xxsum0;
-    return (xxsum0 - ((unsigned int)(xsum0 * xsum0) >> 7));
+    return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 7));
 }
-- 
2.40.0