vp9 svc: fix interger overflow

Overflow was happening in two places:
one in set_encoder_config(), where the input
layer_target_bitrates are converted from kbps to bps,
the other in vp9_calc_pframe_target_size_one_pass_vbr(),
where target is scaled by kf_ratio.

vp9_ratectrl.c:2039: runtime error: signed integer overflow:
-137438983 * 25 cannot be represented in type 'int'

Bug: chromium:1475943

Change-Id: I1ab0980862548c8827fae461df9a7a74425209ff

vp9/encoder/vp9_ratectrl.c

@@ -2036,7 +2036,11 @@ int vp9_calc_pframe_target_size_one_pass_vbr(const VP9_COMP *cpi) {
 int vp9_calc_iframe_target_size_one_pass_vbr(const VP9_COMP *cpi) {
   static const int kf_ratio = 25;
   const RATE_CONTROL *rc = &cpi->rc;
-  const int target = rc->avg_frame_bandwidth * kf_ratio;
+  int target = rc->avg_frame_bandwidth;
+  if (target > INT_MAX / kf_ratio)
+    target = INT_MAX;
+  else
+    target = rc->avg_frame_bandwidth * kf_ratio;
   return vp9_rc_clamp_iframe_target_size(cpi, target);
 }
 

vp9/vp9_cx_iface.c

@@ -639,8 +639,12 @@ static vpx_codec_err_t set_encoder_config(
 
   for (sl = 0; sl < oxcf->ss_number_layers; ++sl) {
     for (tl = 0; tl < oxcf->ts_number_layers; ++tl) {
-      oxcf->layer_target_bitrate[sl * oxcf->ts_number_layers + tl] =
-          1000 * cfg->layer_target_bitrate[sl * oxcf->ts_number_layers + tl];
+      const int layer = sl * oxcf->ts_number_layers + tl;
+      if (cfg->layer_target_bitrate[layer] > INT_MAX / 1000)
+        oxcf->layer_target_bitrate[layer] = INT_MAX;
+      else
+        oxcf->layer_target_bitrate[layer] =
+            1000 * cfg->layer_target_bitrate[layer];
     }
   }
   if (oxcf->ss_number_layers == 1 && oxcf->pass != 0) {