avcodec/dxv: Check remaining space in CHECKPOINT()

Fixes: Timeout (77sec -> 1sec) Fixes: 13407/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXV_fuzzer-5093143018471424 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-03-20 22:29:21 +01:00 · 2019-03-20 22:29:21 +01:00 · 4daec0c677
parent 0ac3befd47
commit 4daec0c677
1 changed files with 2 additions and 0 deletions
--- a/libavcodec/dxv.c
+++ b/libavcodec/dxv.c
@ -256,6 +256,8 @@ static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
 #define CHECKPOINT(x)                                                         \
    do {                                                                      \
        if (state == 0) {                                                     \
+            if (bytestream2_get_bytes_left(gbc) < 4)                          \
+                return AVERROR_INVALIDDATA;                                   \
            value = bytestream2_get_le32(gbc);                                \
            state = 16;                                                       \
        }                                                                     \