Initial commit of all previous Chrome build scripts.

chromium/patches/to_upstream/46_vp3_fix_double_free_invalid_read.patch

+From 7aa2c320924b41edd5ba8be5dfdcb521f7f42a48 Mon Sep 17 00:00:00 2001
+From: "Ronald S. Bultje" <rsbultje@gmail.com>
+Date: Thu, 20 Oct 2011 17:25:53 -0700
+Subject: [PATCH] vp3: fix double free and invalid read.
+
+If token < 0, we read invalid memory. Also, if the last decoding
+iteration before codec close had an error, we didn't sync the frame
+list and may end up free()'ing e.g. what was "last" for one thread
+and "current" for another thread, i.e. double free(). Thus, on error,
+simply erase the framelist.
+---
+ libavcodec/vp3.c |   13 ++++++++-----
+ 1 files changed, 8 insertions(+), 5 deletions(-)
+
+diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
+index 9262c27..62acabf 100644
+--- a/libavcodec/vp3.c
++++ b/libavcodec/vp3.c
+@@ -890,7 +890,7 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
+             /* decode a VLC into a token */
+             token = get_vlc2(gb, vlc_table, 11, 3);
+             /* use the token to get a zero run, a coefficient, and an eob run */
+-            if (token <= 6) {
++            if ((unsigned) token <= 6U) {
+                 eob_run = eob_run_base[token];
+                 if (eob_run_get_bits[token])
+                     eob_run += get_bits(gb, eob_run_get_bits[token]);
+@@ -908,7 +908,7 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
+                     coeff_i        += eob_run;
+                     eob_run = 0;
+                 }
+-            } else {
++            } else if (token >= 0) {
+                 bits_to_get = coeff_get_bits[token];
+                 if (bits_to_get)
+                     bits_to_get = get_bits(gb, bits_to_get);
+@@ -1777,10 +1777,15 @@ static int vp3_update_thread_context(AVCodecContext *dst, const AVCodecContext *
+     Vp3DecodeContext *s = dst->priv_data, *s1 = src->priv_data;
+     int qps_changed = 0, i, err;
+ 
++#define copy_fields(to, from, start_field, end_field) memcpy(&to->start_field, &from->start_field, (char*)&to->end_field - (char*)&to->start_field)
++
+     if (!s1->current_frame.data[0]
+         ||s->width != s1->width
+-        ||s->height!= s1->height)
++        ||s->height!= s1->height) {
++        if (s != s1)
++            copy_fields(s, s1, golden_frame, current_frame);
+         return -1;
++    }
+ 
+     if (s != s1) {
+         // init tables if the first frame hasn't been decoded
+@@ -1796,8 +1801,6 @@ static int vp3_update_thread_context(AVCodecContext *dst, const AVCodecContext *
+             memcpy(s->motion_val[1], s1->motion_val[1], c_fragment_count * sizeof(*s->motion_val[1]));
+         }
+ 
+-#define copy_fields(to, from, start_field, end_field) memcpy(&to->start_field, &from->start_field, (char*)&to->end_field - (char*)&to->start_field)
+-
+         // copy previous frame data
+         copy_fields(s, s1, golden_frame, dsp);
+ 
+-- 
+1.7.6
+