[FFmpeg-cvslog] avcodec/wmavoice: Do not use uninitialized pitch[0]

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Thu Aug 15 00:37:04 2024 +0200| [5a6bfec33d529d47c64b6efbcb810068cdc3470d] | committer: Michael Niedermayer

avcodec/wmavoice: Do not use uninitialized pitch[0]

Fixes: use of uninitialized value
Fixes: 70850/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMAVOICE_fuzzer-4806127362048000

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 53387079301690f1bd38b97fdf31d63194201d17)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5a6bfec33d529d47c64b6efbcb810068cdc3470d
---

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

diff --git a/libavcodec/wmavoice.c b/libavcodec/wmavoice.c
index f6550c6a71..dc8c818fc1 100644
--- a/libavcodec/wmavoice.c
+++ b/libavcodec/wmavoice.c
@@ -1491,6 +1491,8 @@ static int synth_frame(AVCodecContext *ctx, GetBitContext *gb, int frame_idx,
     /* Parse frame type ("frame header"), see frame_descs */
     int bd_idx = s->vbm_tree[get_vlc2(gb, frame_type_vlc.table, 6, 3)], block_nsamples;
 
+    pitch[0] = INT_MAX;
+
     if (bd_idx < 0) {
         av_log(ctx, AV_LOG_ERROR,
                "Invalid frame type VLC code, skipping\n");
@@ -1608,6 +1610,9 @@ static int synth_frame(AVCodecContext *ctx, GetBitContext *gb, int frame_idx,
         double i_lsps[MAX_LSPS];
         float lpcs[MAX_LSPS];
 
+        if(frame_descs[bd_idx].fcb_type >= FCB_TYPE_AW_PULSES && pitch[0] == INT_MAX)
+            return AVERROR_INVALIDDATA;
+
         for (n = 0; n < s->lsps; n++) // LSF -> LSP
             i_lsps[n] = cos(0.5 * (prev_lsps[n] + lsps[n]));
         ff_acelp_lspd2lpc(i_lsps, lpcs, s->lsps >> 1);