xwddec: prevent overflow of lsize * avctx->height
This is used to check if the input buffer is larger enough, so if this overflows it can cause a false negative leading to a segmentation fault in bytestream2_get_bufferu. Signed-off-by: NAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> Signed-off-by: NAnton Khirnov <anton@khirnov.net>
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