[cairo-bugs] [Bug 87766] New: memory leak in _cairo_default_context_set_source_surface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87766

            Bug ID: 87766
           Summary: memory leak in
                    _cairo_default_context_set_source_surface
           Product: cairo
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: chris at chris-wilson.co.uk
          Reporter: sixtysix at inwind.it
        QA Contact: cairo-bugs at cairographics.org

Created attachment 111398
  --> https://bugs.freedesktop.org/attachment.cgi?id=111398&action=edit
testcase

running the attached test case valgrind reports:

>==3== 160 bytes in 1 blocks are definitely lost in loss record 1 of 7
>==3==    at 0x4A06BCF: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
>==3==    by 0x4C645AC: _cairo_pattern_create_solid (cairo/src/cairo-pattern.c:605)
>==3==    by 0x4C645EB: _cairo_pattern_create_in_error.part.20 (cairo/src/cairo-pattern.c:628)
>==3==    by 0x4C3D0E4: _cairo_default_context_set_source_surface (cairo/src/cairo-default-context.c:327)
>==3==    by 0x4C349EE: cairo_set_source_surface (cairo/src/cairo.c:766)
>==3==    by 0x400803: main (/home/massimo/devel/tmp/test-cairo-set-source-surface.c:12)

_cairo_default_context_set_source_surface, when the surface passed in
is in error, returns a pattern->status without destroying the pattern
created which is not a static pattern nor part of a cairo owned set
of error patterns:

http://cgit.freedesktop.org/cairo/tree/src/cairo-default-context.c#n327

Similarly cairo_get_source returns a leaked pattern when the context
passed in is in error:

http://cgit.freedesktop.org/cairo/tree/src/cairo.c#n833

Valgrind reports this one running:

CAIRO_TEST_TARGET=image valgrind --leak-check=full .libs/cairo-test-suite -f 
api-special-cases

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