avformat/wavdec: sanity check channels and bps before using them for block_align

Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_W64_fuzzer-4704044498944000
Fixes: signed integer overflow: 520464 * 8224 cannot be represented in type 'int'

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 75317ec442)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/wavdec.c

@@ -34,6 +34,7 @@
 #include "libavutil/log.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/opt.h"
+#include "libavcodec/internal.h"
 #include "avformat.h"
 #include "avio.h"
 #include "avio_internal.h"
@@ -899,7 +900,9 @@ static int w64_read_header(AVFormatContext *s)
             if (ret < 0)
                 return ret;
             avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
-            if (st->codecpar->block_align) {
+            if (st->codecpar->block_align &&
+                st->codecpar->ch_layout.nb_channels < FF_SANE_NB_CHANNELS &&
+                st->codecpar->bits_per_coded_sample < 128) {
                 int block_align = st->codecpar->block_align;
 
                 block_align = FFMAX(block_align,