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vmnc: Check for integer overflow
Fixes null pointer dereference and potential out of array accesses. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -345,6 +345,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPac
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size_left = buf_size - (src - buf);
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switch(enc) {
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case MAGIC_WMVd: // cursor
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if (w*(int64_t)h*c->bpp2 > INT_MAX/2 - 2) {
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av_log(avctx, AV_LOG_ERROR, "dimensions too large\n");
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return AVERROR_INVALIDDATA;
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}
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if(size_left < 2 + w * h * c->bpp2 * 2) {
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av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", 2 + w * h * c->bpp2 * 2, size_left);
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return -1;
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