[FFmpeg-cvslog] sbrdsp_fixed: assert that input values are in the valid range

[Andreas Cadhalpun]

ffmpeg | branch: release/2.8 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Tue Nov 17 22:58:27 2015 +0100| [7e94ea3dd1e5cbf56926c2b769738a0a51bd35bc] | committer: Andreas Cadhalpun

sbrdsp_fixed: assert that input values are in the valid range

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit a9c20e922cee435c9ad2dc78f6c50651f353329c)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7e94ea3dd1e5cbf56926c2b769738a0a51bd35bc
---

 libavcodec/sbrdsp_fixed.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/sbrdsp_fixed.c b/libavcodec/sbrdsp_fixed.c
index 5b7b7a6..f4e3de0 100644
--- a/libavcodec/sbrdsp_fixed.c
+++ b/libavcodec/sbrdsp_fixed.c
@@ -38,9 +38,14 @@ static SoftFloat sbr_sum_square_c(int (*x)[2], int n)
     int i, nz, round;
 
     for (i = 0; i < n; i += 2) {
+        // Larger values are inavlid and could cause overflows of accu.
+        av_assert2(FFABS(x[i + 0][0]) >> 29 == 0);
         accu += (int64_t)x[i + 0][0] * x[i + 0][0];
+        av_assert2(FFABS(x[i + 0][1]) >> 29 == 0);
         accu += (int64_t)x[i + 0][1] * x[i + 0][1];
+        av_assert2(FFABS(x[i + 1][0]) >> 29 == 0);
         accu += (int64_t)x[i + 1][0] * x[i + 1][0];
+        av_assert2(FFABS(x[i + 1][1]) >> 29 == 0);
         accu += (int64_t)x[i + 1][1] * x[i + 1][1];
     }