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flashsv: make sure data for zlib priming is available

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Fixes a segfault in the fuzzed sample resolutionchange.flv_s314809.

CC: libav-stable@libav.org
This commit is contained in:
Janne Grunau 2012-11-28 17:31:35 +01:00
parent e2718e7a70
commit 3ae69b9166
1 changed files with 5 additions and 0 deletions
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5
libavcodec/flashsv.c
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@ -401,6 +401,11 @@ static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
av_log_missing_feature(avctx, "zlibprime_curr", 1);
return AVERROR_PATCHWELCOME;
}
if (!s->blocks && (s->zlibprime_curr || s->zlibprime_prev)) {
av_log(avctx, AV_LOG_ERROR, "no data available for zlib "
"priming\n");
return AVERROR_INVALIDDATA;
}
size--; // account for flags byte
}