kc3-lang/libjpeg-turbo/doc

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• Hash : 89528757
  Author :
  Date : 2023-07-05T15:35:21
  

  xform fuzz: Use src subsamp to calc dst buf size
  
  Referring to
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=60379
  there are some specially-crafted malformed JPEG images that, when
  transformed to grayscale, will exceed the worst-case transformed
  grayscale JPEG image size.  This is similar in nature to the issue fixed
  by c8d52f1c4c7480277b91420c27b2548d4c8e9043, except that in this case,
  the issue occurs regardless of the amount of metadata in the source
  image.  Also, the tj3Transform() function, the
  Java_org_libjpegturbo_turbojpeg_TJTransformer_transform() JNI function,
  and TJBench were behaving correctly in this case, because the TurboJPEG
  API documentation specifies that the source image's subsampling type
  should be used when computing the worst-case transformed JPEG image
  size.  (However, only the Java API documentation specified that.  Oops.
  The C API documentation now does as well.)  The documented usage
  mitigates the issue, and only the transform fuzzer did not adhere to
  that.  Thus, this was an issue with the fuzzer itself rather than an
  issue with the library.
  

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