Bug 1332953 - Update libopus to 1.1.4. r=kinetik

This fixes a wrap-around issue in SILK LSF stabilization code,
addressing CVE-2017-0381.

MozReview-Commit-ID: 7yCUoSKNOcl

--HG--
extra : rebase_source : da94105d911d7e15b09a549b4b67083a1c2acd93

media/libopus/README_MOZILLA

@@ -8,4 +8,4 @@ files after the copy step.
 
 The upstream repository is https://git.xiph.org/opus.git
 
-The git tag/revision used was v1.1.3.
+The git tag/revision used was v1.1.4.

media/libopus/moz.build

@@ -20,7 +20,7 @@ ALLOW_COMPILER_WARNINGS = True
 FINAL_LIBRARY = 'gkmedias'
 
 DEFINES['OPUS_BUILD'] = True
-DEFINES['OPUS_VERSION'] = '"v1.1.3-mozilla"'
+DEFINES['OPUS_VERSION'] = '"v1.1.4-mozilla"'
 DEFINES['USE_ALLOCA'] = True
 
 # Don't export symbols

media/libopus/silk/NLSF_stabilize.c

@@ -130,7 +130,7 @@ void silk_NLSF_stabilize(
 
         /* Keep delta_min distance between the NLSFs */
         for( i = 1; i < L; i++ )
-            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
+            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], silk_ADD_SAT16( NLSF_Q15[i-1], NDeltaMin_Q15[i] ) );
 
         /* Last NLSF should be no higher than 1 - NDeltaMin[L] */
         NLSF_Q15[L-1] = silk_min_int( NLSF_Q15[L-1], (1<<15) - NDeltaMin_Q15[L] );