avcodec/pixlet: avoid some overflows

Signed-off-by: Paul B Mahol <onemda@gmail.com>
8 years ago · ab31b46b89
parent 43cd33be16
commit ab31b46b89
1 changed files with 2 additions and 2 deletions
--- a/libavcodec/pixlet.c
+++ b/libavcodec/pixlet.c
@ -246,7 +246,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, i
            value = 0;
        } else {
            xflag &= 1u;
-            tmp = c * ((yflag + 1) >> 1) + (c >> 1);
+            tmp = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
            value = xflag + (tmp ^ -xflag);
        }

@ -256,7 +256,7 @@ static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst, i
            j = 0;
            dst += stride;
        }
-        state += d * yflag - (d * state >> 8);
+        state += (int64_t)d * yflag - (d * state >> 8);

        flag = 0;