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@@ -0,0 +1,44 @@
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+From e50aa2252cdd5cb53eef7d8c4503c7edff634f68 Mon Sep 17 00:00:00 2001
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+From: "Richard J. Moore" <rich@kde.org>
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+Date: Tue, 24 Feb 2015 19:02:35 +0000
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+Subject: [PATCH] Fix a division by zero when processing malformed BMP files.
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+
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+This fixes a division by 0 when processing a maliciously crafted BMP
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+file. No impact beyond DoS.
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+
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+Backport of 661f6bfd032dacc62841037732816a583640e187
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+
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+Upstream-Status: Backport
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+
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+Task-number: QTBUG-44547
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+Change-Id: I43f06e752b11cb50669101460902a82b885ae618
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+Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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+Signed-off-by: Jonathan Liu <net147@gmail.com>
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+---
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+ src/gui/image/qbmphandler.cpp | 6 ++++++
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+ 1 file changed, 6 insertions(+)
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+
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+diff --git a/src/gui/image/qbmphandler.cpp b/src/gui/image/qbmphandler.cpp
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+index b22e842..30fa9e0 100644
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+--- a/src/gui/image/qbmphandler.cpp
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++++ b/src/gui/image/qbmphandler.cpp
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+@@ -319,10 +319,16 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, int offset, int
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+ }
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+ } else if (comp == BMP_BITFIELDS && (nbits == 16 || nbits == 32)) {
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+ red_shift = calc_shift(red_mask);
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++ if (((red_mask >> red_shift) + 1) == 0)
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++ return false;
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+ red_scale = 256 / ((red_mask >> red_shift) + 1);
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+ green_shift = calc_shift(green_mask);
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++ if (((green_mask >> green_shift) + 1) == 0)
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++ return false;
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+ green_scale = 256 / ((green_mask >> green_shift) + 1);
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+ blue_shift = calc_shift(blue_mask);
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++ if (((blue_mask >> blue_shift) + 1) == 0)
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++ return false;
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+ blue_scale = 256 / ((blue_mask >> blue_shift) + 1);
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+ } else if (comp == BMP_RGB && (nbits == 24 || nbits == 32)) {
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+ blue_mask = 0x000000ff;
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+--
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+2.3.1
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+
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