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avcodec/vmnc: Check that rectangles are within the picture
Prevents out of array accesses with CODEC_FLAG_EMU_EDGE Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -291,6 +291,11 @@ static int decode_hextile(VmncContext *c, uint8_t* dst, GetByteContext *gb,
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fg = vmnc_get_pixel(gb, bpp, c->bigendian);
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xy = bytestream2_get_byte(gb);
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wh = bytestream2_get_byte(gb);
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if ( (xy >> 4) + (wh >> 4) + 1 > w - i
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|| (xy & 0xF) + (wh & 0xF)+1 > h - j) {
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av_log(c->avctx, AV_LOG_ERROR, "Rectangle outside picture\n");
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return AVERROR_INVALIDDATA;
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}
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paint_rect(dst2, xy >> 4, xy & 0xF,
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(wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride);
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}
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