avcodec/pcm: Fix invalid shift in AV_CODEC_ID_PCM_LXF

Fixes: left shift of 233 by 24 places cannot be represented in type 'int'
Fixes: 20736/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PCM_LXF_fuzzer-4829212685107200
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
index 6346510de0118cfe94bff51c7dd3757f444c9cfb..96a68f7fe813ed2fc09999be24aed3ec0934fecc 100644 (file)
--- a/libavcodec/pcm.c
+++ b/libavcodec/pcm.c
@@ -513,7 +513,7 @@ static int pcm_decode_frame(AVCodecContext *avctx, void *data,
                                  ((src[2] & 0x0F) <<  8) |
                                    src[1];
                 // extract high 20 bits and expand to 32 bits
-                *dst_int32_t++ =  (src[4]         << 24) |
+                *dst_int32_t++ =  ((uint32_t)src[4]<<24) |
                                   (src[3]         << 16) |
                                  ((src[2] & 0xF0) <<  8) |
                                   (src[4]         <<  4) |