Always initialize b->uv_angle in decode_b()

Initialize b->uv_angle to 0 in decode_b(). Fixes a MSan
use-of-uninitialized-value warning about b->uv_angle in
dav1d_recon_b_intra_16bpc(), reported by ClusterFuzz.

1 files changed, 1 insertions, 2 deletions

diff --git a/src/decode.c b/src/decode.c
index 9af9143..cbef36b 100644
--- a/src/decode.c
+++ b/src/decode.c
@@ -1242,6 +1242,7 @@ static int decode_b(Dav1dTaskContext *const t,
             if (DEBUG_BLOCK_INFO)
                 printf("Post-uvmode[%d]: r=%d\n", b->uv_mode, ts->msac.rng);
 
+            b->uv_angle = 0;
             if (b->uv_mode == CFL_PRED) {
 #define SIGN(a) (!!(a) + ((a) > 0))
                 const int sign = dav1d_msac_decode_symbol_adapt8(&ts->msac,
@@ -1274,8 +1275,6 @@ static int decode_b(Dav1dTaskContext *const t,
                 uint16_t *const acdf = ts->cdf.m.angle_delta[b->uv_mode - VERT_PRED];
                 const int angle = dav1d_msac_decode_symbol_adapt8(&ts->msac, acdf, 6);
                 b->uv_angle = angle - 3;
-            } else {
-                b->uv_angle = 0;
             }
         }