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ofz#3240: avoid oom in gif loader

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Change-Id: Ifd00962ed607166b5521a3977a3021fb7b24957e
Reviewed-on: https://gerrit.libreoffice.org/41747
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
This commit is contained in:
Caolán McNamara 2017-08-31 10:49:01 +01:00
parent 2e1cafaf66
commit 4091841023
2 changed files with 10 additions and 3 deletions
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vcl/qa/cppunit/graphicfilter/data/gif/fail/too-small-1.gif Normal file
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13
vcl/source/filter/igif/gifread.cxx
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@ -175,12 +175,19 @@ void GIFReader::CreateBitmaps( long nWidth, long nHeight, BitmapPalette* pPal,
// so assume compression of 1:2560 is possible
// (http://cloudinary.com/blog/a_one_color_image_is_worth_two_thousand_words suggests
// 1:1472.88 [184.11 x 8] is more realistic)
const sal_uInt64 nMinFileData = nWidth * nHeight / 2560;
sal_uInt64 nMinFileData = nWidth * nHeight / 2560;
for (size_t i = 0; i < aAnimation.Count(); ++i)
{
const Size& rSize = aAnimation.Get(i).aSizePix;
nMinFileData += rSize.Width() * rSize.Height() / 2560;
}
if (nMaxStreamData < nMinFileData)
{
//there is nowhere near enough data in this stream to fill the claimed dimensions
SAL_WARN("vcl.filter", "gif claims dimensions " << nWidth << " x " << nHeight <<
" but filesize of " << nMaxStreamData << " is surely insufficiently large to fill it");
SAL_WARN("vcl.filter", "in gif frame index " << aAnimation.Count() << " gif claims dimensions " << nWidth << " x " << nHeight <<
" but filesize of " << nMaxStreamData << " is surely insufficiently large to fill all frame images");
bStatus = false;
return;
}