Bug 141093 – Crash with SIGBUS in `WebCore::WidthIterator::advanceInternal`

• Component: New Bugs
• Status: NEW

[Paul Menzel]

Created attachment 245735 [details]
(gdb) t a a bt f

With Debian Sid/unstable, while reading emails, a self built Evolution 3.12.10 crashes with a bus error. WebKitGTK+ 2.4.8 is used.

    Core was generated by `evolution'.
    Program terminated with signal SIGBUS, Bus error.
    #0  WebCore::WidthIterator::advanceInternal<WebCore::Latin1TextIterator> (this=0xbfe4d47c, textIterator=..., glyphBuffer=0xbfe4d500)
        at ../Source/WebCore/platform/graphics/WidthIterator.cpp:156

Getting the backtrace from the saved core dump file shows the following.

Thread 1 (Thread 0xb026f900 (LWP 3046)):
#0  WebCore::WidthIterator::advanceInternal<WebCore::Latin1TextIterator> (this=0xbfe4d47c, textIterator=..., glyphBuffer=0xbfe4d500)
    at ../Source/WebCore/platform/graphics/WidthIterator.cpp:156
No locals.
#1  0xb57b3035 in WebCore::WidthIterator::advance (this=0xbfe4d47c, offset=<optimized out>, glyphBuffer=0xbfe4d500)
    at ../Source/WebCore/platform/graphics/WidthIterator.cpp:349
        textIterator = {m_characters = 0xa5612a3d "Von:", m_currentCharacter = 0, m_lastCharacter = 4}
        textIterator = {m_characters = 0xa5612a3d, m_currentCharacter = 0, m_lastCharacter = 4, m_endCharacter = -1250218675}
#2  0xb5792858 in WebCore::Font::getGlyphsAndAdvancesForSimpleText (this=0x87673d00, run=..., from=0, to=4, glyphBuffer=..., 
    forTextEmphasis=WebCore::Font::NotForTextEmphasis) at ../Source/WebCore/platform/graphics/FontFastPath.cpp:133
        totalWidth = <optimized out>
        beforeWidth = <optimized out>
        glyphPos = <optimized out>
        afterWidth = <optimized out>
        glyphTo = <optimized out>
        it = {m_font = 0x87673d00, m_run = @0xbfe6d944, m_currentCharacter = 0, m_runWidthSoFar = 0, m_expansion = 0, 
          m_expansionPerOpportunity = 0, m_isAfterExpansion = true, m_finalRoundingWidth = 0, 
          m_characterIndexOfGlyph = {<WTF::VectorBuffer<int, 10u>> = {<WTF::VectorBufferBase<int>> = {m_buffer = 0xbfe4d4a8, 
                m_capacity = 10, m_size = 0}, m_inlineBuffer = {{__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}, {__data = "\000\000\000", __align = {<No data fields>}}, {
                  __data = "\000\000\000", __align = {<No data fields>}}}}, <No data fields>}, m_lastGlyphName = {m_impl = {m_ptr = 0x0}}, 
          m_arabicForms = {<WTF::VectorBuffer<WebCore::SVGGlyph::ArabicForm, 0u>> = {<WTF::VectorBufferBase<WebCore::SVGGlyph::ArabicForm>> = {m_buffer = 0x0, m_capacity = 0, m_size = 0}, <No data fields>}, <No data fields>}, m_typesettingFeatures = 0, m_fallbackFonts = 0x0, 
          m_accountForGlyphBounds = false, m_maxGlyphBoundingBoxY = 1.17549435e-38, m_minGlyphBoundingBoxY = 3.40282347e+38, 
          m_firstGlyphOverflow = 0, m_lastGlyphOverflow = 0, m_forTextEmphasis = false}
        localGlyphBuffer = {
          m_fontData = {<WTF::VectorBuffer<WebCore::SimpleFontData const*, 2048u>> = {<WTF::VectorBufferBase<WebCore::SimpleFontData const*>> = {m_buffer = 0xbfe4d50c, m_capacity = 2048, m_size = 0}, m_inlineBuffer = {{__data = "\224\325", <incomplete sequence \344\277>,

The only thing I spotted is `m_endCharacter = -1250218675}`. No idea if that is correct.

Please find the whole backtrace attached.