[cairo-bugs] [Bug 91271] Conditional jump or move depends on uninitialised value(s) in composite_traps()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91271

--- Comment #1 from Massimo <sixtysix at inwind.it> ---
A similar stack trace is obtained:      

==2146== Conditional jump or move depends on uninitialised value(s)
==2146==    at 0x4CA625A: composite_traps
(cairo/src/cairo-xlib-render-compositor.c:1888)
==2146==    by 0x4C8E5DA: composite_traps
(cairo/src/cairo-traps-compositor.c:1098)
==2146==    by 0x4C8E5DA: composite_mask_clip
(cairo/src/cairo-traps-compositor.c:2035)
==2146==    by 0x4C8EB05: create_composite_mask
(cairo/src/cairo-traps-compositor.c:477)
==2146==    by 0x4C8FAB4: clip_and_composite_with_mask
(cairo/src/cairo-traps-compositor.c:548)
==2146==    by 0x4C8FAB4: clip_and_composite
(cairo/src/cairo-traps-compositor.c:1039)
==2146==    by 0x4C8FE41: _cairo_traps_compositor_mask
(cairo/src/cairo-traps-compositor.c:2102)
==2146==    by 0x4C38D78: _cairo_compositor_mask
(cairo/src/cairo-compositor.c:106)
==2146==    by 0x4C7EE1B: _cairo_surface_mask (cairo/src/cairo-surface.c:2166)
==2146==    by 0x4C85125: _cairo_surface_wrapper_mask
(cairo/src/cairo-surface-wrapper.c:206)
==2146==    by 0x4C70A60: _cairo_recording_surface_replay_internal
(cairo/src/cairo-recording-surface.c:1754)
==2146==    by 0x4C71D48: _cairo_recording_surface_replay_with_clip
(cairo/src/cairo-recording-surface.c:2013)
==2146==    by 0x4C901E5: composite_aligned_boxes
(cairo/src/cairo-traps-compositor.c:1242)
==2146==    by 0x4C901E5: clip_and_composite_boxes.part.13
(cairo/src/cairo-traps-compositor.c:1792)
==2146==    by 0x4C9058C: clip_and_composite_boxes
(cairo/src/cairo-traps-compositor.c:1742)
==2146==    by 0x4C90BD1: _cairo_traps_compositor_paint
(cairo/src/cairo-traps-compositor.c:2063)
==2146==    by 0x4C38CE8: _cairo_compositor_paint
(cairo/src/cairo-compositor.c:65)
==2146==    by 0x4C7EB40: _cairo_surface_paint (cairo/src/cairo-surface.c:2117)
==2146==    by 0x4C4062E: _cairo_gstate_paint (cairo/src/cairo-gstate.c:1067)
==2146==    by 0x4C33BC4: cairo_paint (cairo/src/cairo.c:2003)
==2146==    by 0x43C154: record_replay (cairo/test/record2x.c:377)
==2146==    by 0x40E5F1: cairo_test_for_target (cairo/test/cairo-test.c:929)
==2146==    by 0x40E5F1: _cairo_test_context_run_for_target
(cairo/test/cairo-test.c:1532)
==2146==    by 0x40BA53: _cairo_test_runner_draw
(cairo/test/cairo-test-runner.c:255)
==2146==    by 0x40BA53: main (cairo/test/cairo-test-runner.c:937)
==2146==  Uninitialised value was created by a stack allocation
==2146==    at 0x4CA5EAD: composite_traps
(cairo/src/cairo-xlib-render-compositor.c:1818)


running:

( cd test; DISPLAY=:2 CAIRO_TEST_TARGET=xlib valgrind --track-origins=yes
.libs/cairo-test-suite -f record2x-paint-alpha-clip-mask )

it happens when in 'composite_traps'  traps->num_traps == 0

in that case returning CAIRO_STATUS_SUCCESS at line 1829

http://cgit.freedesktop.org/cairo/tree/src/cairo-xlib-render-compositor.c#n1829

silences valgrind.

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