avcodec/ffv1dec: Check chroma shift parameters

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit d43cd6b08ed555c303478e3133717fbb2236be6e)

Conflicts:

	libavcodec/ffv1dec.c

1 files changed, 12 insertions, 0 deletions

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index d1e6e4e864..eb8606a44a 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -507,6 +507,12 @@ static int read_extra_header(FFV1Context *f)
     f->num_h_slices               = 1 + get_symbol(c, state, 0);
     f->num_v_slices               = 1 + get_symbol(c, state, 0);
 
+    if (f->chroma_h_shift > 4U || f->chroma_v_shift > 4U) {
+        av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
+               f->chroma_h_shift, f->chroma_v_shift);
+        return AVERROR_INVALIDDATA;
+    }
+
     if (f->num_h_slices > (unsigned)f->width  || !f->num_h_slices ||
         f->num_v_slices > (unsigned)f->height || !f->num_v_slices
        ) {
@@ -598,6 +604,12 @@ static int read_header(FFV1Context *f)
             }
         }
 
+        if (chroma_h_shift > 4U || chroma_v_shift > 4U) {
+            av_log(f->avctx, AV_LOG_ERROR, "chroma shift parameters %d %d are invalid\n",
+                   chroma_h_shift, chroma_v_shift);
+            return AVERROR_INVALIDDATA;
+        }
+
         f->colorspace     = colorspace;
         f->avctx->bits_per_raw_sample = bits_per_raw_sample;
         f->chroma_planes  = chroma_planes;