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flashsv: check for keyframe before using differential coding

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Fixes a segfault in te fuzzed sample resolutionchange.flv_s211713.

CC: libav-stable@libav.org
(cherry picked from commit 5ae72f5453)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Janne Grunau
2012-11-24 15:50:03 +01:00
committed by Reinhard Tartler
parent d282e5ce72
commit 522e97bd9e
1 changed files with 5 additions and 0 deletions
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5
libavcodec/flashsv.c
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@@ -370,6 +370,11 @@ static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
} }
if (has_diff) { if (has_diff) {
if (!s->keyframe) {
av_log(avctx, AV_LOG_ERROR,
"inter frame without keyframe\n");
return AVERROR_INVALIDDATA;
}
s->diff_start = get_bits(&gb, 8); s->diff_start = get_bits(&gb, 8);
s->diff_height = get_bits(&gb, 8); s->diff_height = get_bits(&gb, 8);
av_log(avctx, AV_LOG_DEBUG, av_log(avctx, AV_LOG_DEBUG,