avcodec: v4l2_m2m: fix races around freeing data on close

[ffmpeg] / libavcodec / dnxhddec.c

diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
index f46e41a4562393328c6ef14012df6bbf1bc75689..11d0bf424aae4f4d1689fd64c1550083c3283d30 100644 (file)
--- a/libavcodec/dnxhddec.c
+++ b/libavcodec/dnxhddec.c
@@ -93,7 +93,9 @@ static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
 
     ctx->avctx = avctx;
     ctx->cid = -1;
-    avctx->colorspace = AVCOL_SPC_BT709;
+    if (avctx->colorspace == AVCOL_SPC_UNSPECIFIED) {
+        avctx->colorspace = AVCOL_SPC_BT709;
+    }
 
     avctx->coded_width  = FFALIGN(avctx->width,  16);
     avctx->coded_height = FFALIGN(avctx->height, 16);
@@ -381,6 +383,10 @@ static av_always_inline int dnxhd_decode_dct_block(const DNXHDContext *ctx,
 
     UPDATE_CACHE(bs, &row->gb);
     GET_VLC(len, bs, &row->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
+    if (len < 0) {
+        ret = len;
+        goto error;
+    }
     if (len) {
         level = GET_CACHE(bs, &row->gb);
         LAST_SKIP_BITS(bs, &row->gb, len);
@@ -434,7 +440,7 @@ static av_always_inline int dnxhd_decode_dct_block(const DNXHDContext *ctx,
         GET_VLC(index1, bs, &row->gb, ctx->ac_vlc.table,
                 DNXHD_VLC_BITS, 2);
     }
-
+error:
     CLOSE_READER(bs, &row->gb);
     return ret;
 }