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Fixes crash in bmp and ico image decoding

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Fuzzing test revealed that for certain malformed bmp and ico files,
the handler would segfault.

Change-Id: I19d45145f31e7f808f7f6a1a1610270ea4159cbe
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
This commit is contained in:
Eirik Aavitsland 2015-03-11 13:34:01 +01:00 committed by aavit
parent d3048a2979
commit 51ec7ebfe5
2 changed files with 8 additions and 7 deletions
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13
src/gui/image/qbmphandler.cpp
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@ -484,12 +484,6 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, int offset, int
p = data + (h-y-1)*bpl;
break;
case 2: // delta (jump)
// Protection
if ((uint)x >= (uint)w)
x = w-1;
if ((uint)y >= (uint)h)
y = h-1;
{
quint8 tmp;
d->getChar((char *)&tmp);
@ -497,6 +491,13 @@ static bool read_dib_body(QDataStream &s, const BMP_INFOHDR &bi, int offset, int
d->getChar((char *)&tmp);
y += tmp;
}
// Protection
if ((uint)x >= (uint)w)
x = w-1;
if ((uint)y >= (uint)h)
y = h-1;
p = data + (h-y-1)*bpl + x;
break;
default: // absolute mode

2
src/plugins/imageformats/ico/qicohandler.cpp
View File

@ -567,7 +567,7 @@ QImage ICOReader::iconAt(int index)
QImage::Format format = QImage::Format_ARGB32;
if (icoAttrib.nbits == 24)
format = QImage::Format_RGB32;
else if (icoAttrib.ncolors == 2)
else if (icoAttrib.ncolors == 2 && icoAttrib.depth == 1)
format = QImage::Format_Mono;
else if (icoAttrib.ncolors > 0)
format = QImage::Format_Indexed8;