tree b619ccc9a4091eae9675394077506104bae98f9b
parent 8fa70367ed5bbdc0685494e8212d975b5c89a77d
author DRC <information@libjpeg-turbo.org> 1618547511 -0500
committer DRC <information@libjpeg-turbo.org> 1618548375 -0500

Huff decs: Fix/suppress more innocuous UBSan errs

- UBSan complained that entropy->restarts_to_go was underflowing an
  unsigned integer when it was decremented while
  cinfo->restart_interval == 0.  That was, of course, completely
  innocuous behavior, since the result of the underflowing computation
  was never used.

- d3a3a73f64041c6a6905faf6f9f9832e735fd880 and
  7bc9fca4309563d66b0c5665a616285d0e9baeb4 silenced a UBSan signed
  integer overflow error, but unfortunately other malformed JPEG images
  have been discovered that cause unsigned integer overflow in the same
  computation.  Since, to the best of our understanding, this behavior
  is innocuous, this commit reverts the commits listed above, suppresses
  the UBSan errors, and adds code comments to document the issue.