lavu/x86/tx_float: fix FMA3 implying AVX2 is available

[ffmpeg] / libavcodec / prosumer.c

diff --git a/libavcodec/prosumer.c b/libavcodec/prosumer.c
index 9143bb1bf4c6ac3996c7bbbd5b5af978e5b04e23..9950519604c53a8f8f618a8527708095d3f8534e 100644 (file)
--- a/libavcodec/prosumer.c
+++ b/libavcodec/prosumer.c
@@ -96,6 +96,8 @@ static int decompress(GetByteContext *gb, int size, PutByteContext *pb, const ui
             }
             idx = a >> 20;
             b = lut[2 * idx];
+            if (!b)
+                return AVERROR_INVALIDDATA;
             continue;
         }
         idx = 2;
@@ -151,11 +153,17 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     if (avpkt->size <= 32)
         return AVERROR_INVALIDDATA;
 
-    memset(s->decbuffer, 0, s->size);
     bytestream2_init(&s->gb, avpkt->data, avpkt->size);
     bytestream2_init_writer(&s->pb, s->decbuffer, s->size);
+    ret = decompress(&s->gb, AV_RL32(avpkt->data + 28) >> 1, &s->pb, s->lut);
+    if (ret < 0)
+        return ret;
+    if (bytestream2_get_bytes_left_p(&s->pb) > s->size * (int64_t)avctx->discard_damaged_percentage / 100)
+        return AVERROR_INVALIDDATA;
+
+    av_assert0(s->size >= bytestream2_get_bytes_left_p(&s->pb));
+    memset(s->decbuffer + bytestream2_tell_p(&s->pb), 0, bytestream2_get_bytes_left_p(&s->pb));
 
-    decompress(&s->gb, AV_RL32(avpkt->data + 28) >> 1, &s->pb, s->lut);
     vertical_predict((uint32_t *)s->decbuffer, 0, (uint32_t *)s->initial_line, s->stride, 1);
     vertical_predict((uint32_t *)s->decbuffer, s->stride, (uint32_t *)s->decbuffer, s->stride, avctx->height - 1);