Re^5: prevent arbitrary code execution in images

[pingo]

Out of curiosity, I tried converting two jpegs to pngs (using convert). One of them became four times bigger, the other one nine times bigger.

(BTW, I also tried converting the same jpegs to gifs, and they became five and six times larger.)

[paulbort]

You discard the conversion output. You just want to know if it worked or not. Like a regex without parens, the only thing you're looking for is metadata.