[FFmpeg-cvslog] avcodec/wmavoice: Check operations that can fail

[Andreas Rheinhardt]

ffmpeg | branch: release/4.4 | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Sat Apr  3 17:45:17 2021 +0200| [ed7efbe3ab94088fcad2785cf1d71195b4c506c6] | committer: Andreas Rheinhardt

avcodec/wmavoice: Check operations that can fail

There might be segfaults on failure.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
(cherry picked from commit e93875b756b575438d7b825332739719d4fbc600)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ed7efbe3ab94088fcad2785cf1d71195b4c506c6
---

 libavcodec/wmavoice.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/libavcodec/wmavoice.c b/libavcodec/wmavoice.c
index fbdb865360..f1e1504a88 100644
--- a/libavcodec/wmavoice.c
+++ b/libavcodec/wmavoice.c
@@ -367,7 +367,7 @@ static av_cold void wmavoice_flush(AVCodecContext *ctx)
 static av_cold int wmavoice_decode_init(AVCodecContext *ctx)
 {
     static AVOnce init_static_once = AV_ONCE_INIT;
-    int n, flags, pitch_range, lsp16_flag;
+    int n, flags, pitch_range, lsp16_flag, ret;
     WMAVoiceContext *s = ctx->priv_data;
 
     ff_thread_once(&init_static_once, wmavoice_init_static_data);
@@ -395,10 +395,11 @@ static av_cold int wmavoice_decode_init(AVCodecContext *ctx)
     s->spillover_bitsize = 3 + av_ceil_log2(ctx->block_align);
     s->do_apf            =    flags & 0x1;
     if (s->do_apf) {
-        ff_rdft_init(&s->rdft,  7, DFT_R2C);
-        ff_rdft_init(&s->irdft, 7, IDFT_C2R);
-        ff_dct_init(&s->dct,  6, DCT_I);
-        ff_dct_init(&s->dst,  6, DST_I);
+        if ((ret = ff_rdft_init(&s->rdft,  7,  DFT_R2C)) < 0 ||
+            (ret = ff_rdft_init(&s->irdft, 7, IDFT_C2R)) < 0 ||
+            (ret = ff_dct_init (&s->dct,   6,    DCT_I)) < 0 ||
+            (ret = ff_dct_init (&s->dst,   6,    DST_I)) < 0)
+            return ret;
 
         ff_sine_window_init(s->cos, 256);
         memcpy(&s->sin[255], s->cos, 256 * sizeof(s->cos[0]));