two more ReadGIF tweaks
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@36601 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@@ -803,7 +803,7 @@ int wxGIFDecoder::ReadGIF()
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pimg->w = buf[4] + 256 * buf[5];
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pimg->h = buf[6] + 256 * buf[7];
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if (pimg->w == 0 || pimg->h == 0)
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if ((pimg->w <= 0) || (pimg->w > maxScreenSize) || (pimg->h <= 0) || (pimg->h > maxScreenSize))
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{
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Destroy();
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return wxGIF_INVFORMAT;
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@@ -835,8 +835,9 @@ int wxGIFDecoder::ReadGIF()
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{
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ncolors = 2 << (buf[8] & 0x07);
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size_t numBytes = 3 * ncolors;
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if (numBytes > 0)
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m_f->Read(pimg->pal, numBytes);
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if (m_f->LastRead() != numBytes)
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if ((numBytes <= 0) || (m_f->LastRead() != numBytes))
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{
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Destroy();
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return wxGIF_INVFORMAT;
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