vcl/inc/sallayout.hxx | 2 ++
vcl/source/gdi/sallayout.cxx | 5 +++++
vcl/source/outdev/font.cxx | 19 +++++++++++++------
3 files changed, 20 insertions(+), 6 deletions(-)
New commits:
commit 95ae027d5e331847d6ac695d11c299f2ca0e4ca1
Author: Caolán McNamara <caol...@redhat.com>
AuthorDate: Thu Dec 3 15:38:21 2020 +0000
Commit: Caolán McNamara <caol...@redhat.com>
CommitDate: Thu Dec 3 21:22:45 2020 +0100
cid#1468270 Wrapper object use after free
I think this is a better reflection of the original intent here before
commit 1441ab9c75a2f0ac664983db22b681a1b602f8a9
fix possible SIGSEGV
and
commit 8f54136caa786523fd224f6c98fc8e7c45cd805d
use std::unique_ptr for SalLayout
Change-Id: Ib4ab63334e644a8136b9f7da20916715850563ff
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/107171
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caol...@redhat.com>
diff --git a/vcl/inc/sallayout.hxx b/vcl/inc/sallayout.hxx
index bf93c0f64028..30fd5580b4c5 100644
--- a/vcl/inc/sallayout.hxx
+++ b/vcl/inc/sallayout.hxx
@@ -138,6 +138,8 @@ public:
// used only by OutputDevice::ImplLayout, TODO: make friend
explicit MultiSalLayout( std::unique_ptr<SalLayout> pBaseLayout );
void AddFallback(std::unique_ptr<SalLayout> pFallbackLayout,
ImplLayoutRuns const &);
+ // give up ownership of the initial pBaseLayout taken by the ctor
+ std::unique_ptr<SalLayout> ReleaseBaseLayout();
bool LayoutText(ImplLayoutArgs&, const SalLayoutGlyphs*)
override;
void AdjustLayout(ImplLayoutArgs&) override;
void InitFont() const override;
diff --git a/vcl/source/gdi/sallayout.cxx b/vcl/source/gdi/sallayout.cxx
index 7beea9a01091..eaa03d22e5f0 100644
--- a/vcl/source/gdi/sallayout.cxx
+++ b/vcl/source/gdi/sallayout.cxx
@@ -996,6 +996,11 @@ MultiSalLayout::MultiSalLayout( std::unique_ptr<SalLayout>
pBaseLayout )
mnUnitsPerPixel = mpLayouts[ 0 ]->GetUnitsPerPixel();
}
+std::unique_ptr<SalLayout> MultiSalLayout::ReleaseBaseLayout()
+{
+ return std::move(mpLayouts[0]);
+}
+
void MultiSalLayout::SetIncomplete(bool bIncomplete)
{
mbIncomplete = bIncomplete;
diff --git a/vcl/source/outdev/font.cxx b/vcl/source/outdev/font.cxx
index 6963fd77c3e1..2cd38a58ba11 100644
--- a/vcl/source/outdev/font.cxx
+++ b/vcl/source/outdev/font.cxx
@@ -1246,9 +1246,6 @@ std::unique_ptr<SalLayout>
OutputDevice::ImplGlyphFallbackLayout( std::unique_pt
return nullptr;
}
- // keep a pointer to the layout because we might move ownership of the
unique_ptr
- const SalLayout* pSalLayoutTmp = pSalLayout.get();
-
// prepare multi level glyph fallback
std::unique_ptr<MultiSalLayout> pMultiSalLayout;
ImplLayoutRuns aLayoutRuns = rLayoutArgs.maRuns;
@@ -1306,11 +1303,21 @@ std::unique_ptr<SalLayout>
OutputDevice::ImplGlyphFallbackLayout( std::unique_pt
break;
}
- if( pMultiSalLayout && pMultiSalLayout->LayoutText( rLayoutArgs, nullptr )
)
- pSalLayout = std::move(pMultiSalLayout);
+ if (pMultiSalLayout) // due to missing glyphs, multilevel layout fallback
attempted
+ {
+ // if it works, use that Layout
+ if (pMultiSalLayout->LayoutText(rLayoutArgs, nullptr))
+ pSalLayout = std::move(pMultiSalLayout);
+ else
+ {
+ // if it doesn't, give up and restore ownership of the pSalLayout
+ // back to its original state
+ pSalLayout = pMultiSalLayout->ReleaseBaseLayout();
+ }
+ }
// restore orig font settings
- pSalLayoutTmp->InitFont();
+ pSalLayout->InitFont();
rLayoutArgs.maRuns = aLayoutRuns;
return pSalLayout;
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