[FFmpeg-cvslog] avcodec/wnv1: Check for width =1

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jul  3 02:31:47 2022 +0200| [f0aeea08a9310da79ef05cd4b631931aa699f751] | committer: Michael Niedermayer

avcodec/wnv1: Check for width =1

The decoder only outputs pixels for width >1 images, fail early

Fixes: Timeout
Fixes: 48298/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WNV1_fuzzer-6198626319204352

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 d98d5a436aa70d3cef8f914c0467ef2fb2dd1dfc)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f0aeea08a9310da79ef05cd4b631931aa699f751
---

 libavcodec/wnv1.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/wnv1.c b/libavcodec/wnv1.c
index 915e9c7dc9..291be78cc8 100644
--- a/libavcodec/wnv1.c
+++ b/libavcodec/wnv1.c
@@ -136,6 +136,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
 {
     static VLC_TYPE code_table[1 << CODE_VLC_BITS][2];
 
+    if (avctx->width <= 1)
+        return AVERROR_INVALIDDATA;
+
     avctx->pix_fmt = AV_PIX_FMT_YUV422P;
 
     code_vlc.table           = code_table;