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indeo5: prevent null pointer dereference on broken files

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Found by John Villamil <johnv@matasano.com>
(cherry picked from commit 366ac22ea5)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Janne Grunau 2012-01-23 21:33:34 +01:00 • committed by Reinhard Tartler
parent dc8371b2b1
commit 3efe6becc7
1 changed files with 4 additions and 0 deletions
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4
libavcodec/indeo5.c
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@ -426,6 +426,10 @@ static int decode_mb_info(IVI45DecContext *ctx, IVIBandDesc *band,
ref_mb = tile->ref_mbs;
offs = tile->ypos * band->pitch + tile->xpos;
if (!ref_mb &&
((band->qdelta_present && band->inherit_qdelta) || band->inherit_mv))
return AVERROR_INVALIDDATA;
/* scale factor for motion vectors */
mv_scale = (ctx->planes[0].bands[0].mb_size >> 3) - (band->mb_size >> 3);
mv_x = mv_y = 0;