[FFmpeg-devel] [PATCH 2/3] avcodec/vc1dec: Allocate only as much space as is unescaped

[Michael Niedermayer]

Fixes: OOM
Fixes: 18137/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-5723834900021248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/vc1dec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index ac3198e4fd..8befc6dfd8 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -694,7 +694,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                         goto err;
                     }
                     slices = tmp;
-                    slices[n_slices].buf = av_mallocz(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
+                    slices[n_slices].buf = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
                     if (!slices[n_slices].buf) {
                         ret = AVERROR(ENOMEM);
                         goto err;
@@ -723,7 +723,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data,
                         goto err;
                     }
                     slices = tmp;
-                    slices[n_slices].buf = av_mallocz(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
+                    slices[n_slices].buf = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
                     if (!slices[n_slices].buf) {
                         ret = AVERROR(ENOMEM);
                         goto err;
-- 
2.23.0