diff options
author | Caolán McNamara <caolanm@redhat.com> | 2021-09-10 16:12:02 +0100 |
---|---|---|
committer | Andras Timar <andras.timar@collabora.com> | 2021-09-30 11:01:47 +0200 |
commit | cf156d6417f67acae70aa5e2ef5626ad163e814f (patch) | |
tree | 53a38526f4f49561afa89b1d408c6d9f35d0f36c /include/vcl | |
parent | 619676a94c6726422f5a447b0e5c732fe24b2c8f (diff) |
crashtesting: threaded scaling crash on re-export of ooo24840-1.sxw to odt
#13 0x00007f1cb843752a in o3tl::cow_wrapper<ImplBitmapPalette, o3tl::UnsafeRefCountingPolicy>::operator->() (this=0x5596086d5968) at include/o3tl/cow_wrapper.hxx:329
__PRETTY_FUNCTION__ = "BitmapColor& BitmapPalette::operator[](sal_uInt16)"
#14 0x00007f1cb843752a in BitmapPalette::operator[](unsigned short) (this=0x5596086d5968, nIndex=nIndex@entry=0) at vcl/source/bitmap/bitmappalette.cxx:139
__PRETTY_FUNCTION__ = "BitmapColor& BitmapPalette::operator[](sal_uInt16)"
#15 0x00007f1cb849f5f5 in BitmapInfoAccess::GetPaletteColor(unsigned short) const (nColor=0, this=0x5596085989f0) at include/vcl/BitmapInfoAccess.hxx:114
__PRETTY_FUNCTION__ = "const BitmapColor& BitmapInfoAccess::GetPaletteColor(sal_uInt16) const"
the mpBuffer member of BitmapInfoAccess is
BitmapBuffer* mpBuffer;
not
const BitmapBuffer* mpBuffer;
so mpBuffer->maPalette.foo() calls non-const variants of foo(),
(BitmapPalette::operator[](unsigned short) in this case), which
is presumably non the expected outcome, as the copy-on-write mpImpl of
BitmapPalette unsafely creates a new copy its internals on the first
dereference of mpImpl in a non-const method.
Change-Id: I1ebb3c67386a9028e5b8bab4b2d1cc5862700aa1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/121917
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Diffstat (limited to 'include/vcl')
-rw-r--r-- | include/vcl/bitmapaccess.hxx | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/include/vcl/bitmapaccess.hxx b/include/vcl/bitmapaccess.hxx index 12304d96ff86..559b5c7a3c02 100644 --- a/include/vcl/bitmapaccess.hxx +++ b/include/vcl/bitmapaccess.hxx @@ -96,31 +96,39 @@ public: bool HasPalette() const { - assert(mpBuffer && "Access is not valid!"); + const BitmapBuffer* pBuffer = mpBuffer; + + assert(pBuffer && "Access is not valid!"); - return mpBuffer && !!mpBuffer->maPalette; + return pBuffer && !!pBuffer->maPalette; } const BitmapPalette& GetPalette() const { - assert(mpBuffer && "Access is not valid!"); + const BitmapBuffer* pBuffer = mpBuffer; - return mpBuffer->maPalette; + assert(pBuffer && "Access is not valid!"); + + return pBuffer->maPalette; } sal_uInt16 GetPaletteEntryCount() const { + const BitmapBuffer* pBuffer = mpBuffer; + assert(HasPalette() && "Bitmap has no palette!"); - return HasPalette() ? mpBuffer->maPalette.GetEntryCount() : 0; + return HasPalette() ? pBuffer->maPalette.GetEntryCount() : 0; } const BitmapColor& GetPaletteColor( sal_uInt16 nColor ) const { - assert(mpBuffer && "Access is not valid!"); + const BitmapBuffer* pBuffer = mpBuffer; + + assert(pBuffer && "Access is not valid!"); assert(HasPalette() && "Bitmap has no palette!"); - return mpBuffer->maPalette[nColor]; + return pBuffer->maPalette[nColor]; } const BitmapColor& GetBestPaletteColor(const BitmapColor& rBitmapColor) const @@ -130,11 +138,13 @@ public: sal_uInt16 GetBestPaletteIndex(const BitmapColor& rBitmapColor) const; - ColorMask& GetColorMask() const + const ColorMask& GetColorMask() const { - assert(mpBuffer && "Access is not valid!"); + const BitmapBuffer* pBuffer = mpBuffer; + + assert(pBuffer && "Access is not valid!"); - return mpBuffer->maColorMask; + return pBuffer->maColorMask; } private: @@ -207,7 +217,10 @@ public: BitmapColor GetColor(tools::Long nY, tools::Long nX) const { if (HasPalette()) - return mpBuffer->maPalette[GetPixelIndex(nY, nX)]; + { + const BitmapBuffer* pBuffer = mpBuffer; + return pBuffer->maPalette[GetPixelIndex(nY, nX)]; + } else return GetPixel(nY, nX); } |