diff options
author | Lars Knoll <lars.knoll@digia.com> | 2014-03-25 15:04:22 +0100 |
---|---|---|
committer | The Qt Project <gerrit-noreply@qt-project.org> | 2014-03-28 22:52:19 +0100 |
commit | c4d8734c504cf0f313245befa34501e7314b4cd1 (patch) | |
tree | fe7c21c9e75b2cfbb3d4c95eb04ccf56bae38ce7 /src/gui/painting/qdrawhelper_neon.cpp | |
parent | 123ae472e2668a1f57f7c69a1a2a59336f83d06a (diff) |
Avoid out of bounds memory reads when scaling images
The calculation of the width/height required for the
scaling algorithm was prone to floating point rounding
issues, where the lower value got rounded down, the higher
one rounded up. This could lead to a situation where we
iterated over one more line/pixel in the line than we have
in the source image.
Correct this by passing the dimension of the source image into
the function and bounds checking the values before iterating.
Task-number: QTBUG-35927
Change-Id: If44b2235a479224660d508a0504fec40d724763a
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Diffstat (limited to 'src/gui/painting/qdrawhelper_neon.cpp')
-rw-r--r-- | src/gui/painting/qdrawhelper_neon.cpp | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/src/gui/painting/qdrawhelper_neon.cpp b/src/gui/painting/qdrawhelper_neon.cpp index a40166d5be..3ac92122bb 100644 --- a/src/gui/painting/qdrawhelper_neon.cpp +++ b/src/gui/painting/qdrawhelper_neon.cpp @@ -539,7 +539,7 @@ Blend_on_RGB16_SourceAndConstAlpha_Neon_create(BlendFunc blender, int const_alph } void qt_scale_image_argb32_on_rgb16_neon(uchar *destPixels, int dbpl, - const uchar *srcPixels, int sbpl, + const uchar *srcPixels, int sbpl, int srch, const QRectF &targetRect, const QRectF &sourceRect, const QRect &clip, @@ -548,19 +548,19 @@ void qt_scale_image_argb32_on_rgb16_neon(uchar *destPixels, int dbpl, if (const_alpha == 0) return; - qt_scale_image_16bit<quint32>(destPixels, dbpl, srcPixels, sbpl, targetRect, sourceRect, clip, + qt_scale_image_16bit<quint32>(destPixels, dbpl, srcPixels, sbpl, srch, targetRect, sourceRect, clip, Blend_on_RGB16_SourceAndConstAlpha_Neon_create<quint32>(blend_8_pixels_argb32_on_rgb16_neon, const_alpha)); } void qt_scale_image_rgb16_on_rgb16(uchar *destPixels, int dbpl, - const uchar *srcPixels, int sbpl, + const uchar *srcPixels, int sbpl, int srch, const QRectF &targetRect, const QRectF &sourceRect, const QRect &clip, int const_alpha); void qt_scale_image_rgb16_on_rgb16_neon(uchar *destPixels, int dbpl, - const uchar *srcPixels, int sbpl, + const uchar *srcPixels, int sbpl, int srch, const QRectF &targetRect, const QRectF &sourceRect, const QRect &clip, @@ -570,11 +570,11 @@ void qt_scale_image_rgb16_on_rgb16_neon(uchar *destPixels, int dbpl, return; if (const_alpha == 256) { - qt_scale_image_rgb16_on_rgb16(destPixels, dbpl, srcPixels, sbpl, targetRect, sourceRect, clip, const_alpha); + qt_scale_image_rgb16_on_rgb16(destPixels, dbpl, srcPixels, sbpl, srch, targetRect, sourceRect, clip, const_alpha); return; } - qt_scale_image_16bit<quint16>(destPixels, dbpl, srcPixels, sbpl, targetRect, sourceRect, clip, + qt_scale_image_16bit<quint16>(destPixels, dbpl, srcPixels, sbpl, srch, targetRect, sourceRect, clip, Blend_on_RGB16_SourceAndConstAlpha_Neon_create<quint16>(blend_8_pixels_rgb16_on_rgb16_neon, const_alpha)); } |