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1 Commits

Author SHA1 Message Date
Ondrej Dubaj
dc2735f5a8 Potential double-free in gdImage*Ptr()
Whenever `gdImage*Ptr()` calls `gdImage*Ctx()` and the latter fails, we
must not call `gdDPExtractData()`; otherwise a double-free would
happen.  Since `gdImage*Ctx()` are void functions, and we can't change
that for BC reasons, we're introducing static helpers which are used
internally.

We're adding a regression test for `gdImageJpegPtr()`, but not for
`gdImageGifPtr()` and `gdImageWbmpPtr()` since we don't know how to
trigger failure of the respective `gdImage*Ctx()` calls.

This potential security issue has been reported by Solmaz Salimi (aka.
Rooney).
2019-11-01 09:21:22 +01:00