smacker: check buffer size before reading output size

cf044f8b · Justin Ruggles · e190e453 · cf044f8b
Commit cf044f8b authored Sep 21, 2011 by Justin Ruggles
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smacker.c libavcodec/smacker.c +5 -0

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--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -586,6 +586,11 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
    int bits, stereo;
    int pred[2] = {0, 0};

+    if (buf_size <= 4) {
+        av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+        return AVERROR(EINVAL);
+    }
+
    unp_size = AV_RL32(buf);

    init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);