[FFmpeg-cvslog] avcodec/m101: Move checks before ff_get_buffer()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Aug 21 23:55:39 2022 +0200| [4d5c0cca94e384a3b50fad40624d7dbdcf2a50ec] | committer: Michael Niedermayer

avcodec/m101: Move checks before ff_get_buffer()

Fixes: Timeout
Fixes: 50109/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_M101_fuzzer-6553193986785280

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4d5c0cca94e384a3b50fad40624d7dbdcf2a50ec
---

 libavcodec/m101.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/libavcodec/m101.c b/libavcodec/m101.c
index 7c719006ec..5a06f02c37 100644
--- a/libavcodec/m101.c
+++ b/libavcodec/m101.c
@@ -53,11 +53,6 @@ static int m101_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     int min_stride = 2 * avctx->width;
     int bits = avctx->extradata[2*4];
 
-    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
-        return ret;
-    frame->pict_type = AV_PICTURE_TYPE_I;
-    frame->key_frame = 1;
-
     stride = AV_RL32(avctx->extradata + 5*4);
 
     if (avctx->pix_fmt == AV_PIX_FMT_YUV422P10)
@@ -69,6 +64,10 @@ static int m101_decode_frame(AVCodecContext *avctx, AVFrame *frame,
         return AVERROR_INVALIDDATA;
     }
 
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    frame->pict_type = AV_PICTURE_TYPE_I;
+    frame->key_frame = 1;
     frame->interlaced_frame = ((avctx->extradata[3*4] & 3) != 3);
     if (frame->interlaced_frame)
         frame->top_field_first = avctx->extradata[3*4] & 1;