avcodec/rscc: Check input size for raw mode

Fixes out of array read
Fixes: 7fcd09eadd046e326d8ea0af66f166c8/asan_heap-oob_4a52e5_2273_fa6078a10dd575df266fb1e0b4114cd5.avi

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/rscc.c

@@ -221,6 +221,11 @@ static int rscc_decode_frame(AVCodecContext *avctx, void *data,
 
     /* Get pixels buffer, it may be deflated or just raw */
     if (pixel_size == packed_size) {
+        if (bytestream2_get_bytes_left(gbc) < pixel_size) {
+            av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", pixel_size);
+            ret = AVERROR_INVALIDDATA;
+            goto end;
+        }
         pixels = gbc->buffer;
     } else {
         uLongf len = ctx->inflated_size;