Fix error reported by ASAN in 2279.asan.0.1904.pdf

==20507== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60420000ff04 at pc 0x7fa1492e8012 bp 0x7fff8406d900 sp 0x7fff8406d8f8
READ of size 4 at 0x60420000ff04 thread T0
    #0 0x7fa1492e8011 in SplashFTFont::makeGlyph(int, int, int, SplashGlyphBitmap*, int, int, SplashClip*, SplashClipResult*) /home/tsdgeos/devel/poppler/splash/SplashFTFont.cc:284
    #1 0x7fa1492eda32 in SplashFont::getGlyph(int, int, int, SplashGlyphBitmap*, int, int, SplashClip*, SplashClipResult*) /home/tsdgeos/devel/poppler/splash/SplashFont.cc:168
    #2 0x7fa1492e7c69 in SplashFTFont::getGlyph(int, int, int, SplashGlyphBitmap*, int, int, SplashClip*, SplashClipResult*) /home/tsdgeos/devel/poppler/splash/SplashFTFont.cc:233
    #3 0x7fa1492b3368 in Splash::fillChar(double, double, int, SplashFont*) /home/tsdgeos/devel/poppler/splash/Splash.cc:2714
    #4 0x7fa149286a20 in SplashOutputDev::drawChar(GfxState*, double, double, double, double, double, double, unsigned int, int, unsigned int*, int) /home/tsdgeos/devel/poppler/poppler/SplashOutputDev.cc:2270
    #5 0x7fa1490e7599 in Gfx::doShowText(GooString*) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:4054
    #6 0x7fa1490e4db0 in Gfx::opShowSpaceText(Object*, int) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:3886
    #7 0x7fa1490c333a in Gfx::execOp(Object*, Object*, int) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:903
    #8 0x7fa1490c250f in Gfx::go(bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:762
    #9 0x7fa1490c2163 in Gfx::display(Object*, bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:728
    #10 0x7fa1491a4dd1 in Page::displaySlice(OutputDev*, double, double, int, bool, bool, int, int, int, int, bool, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/Page.cc:585
    #11 0x7fa1491ac2fd in PDFDoc::displayPageSlice(OutputDev*, int, double, double, int, bool, bool, bool, int, int, int, int, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/PDFDoc.cc:503
    #12 0x40311e in savePageSlice(PDFDoc*, SplashOutputDev*, int, int, int, int, int, double, double, char*) /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:222
    #13 0x404416 in main /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:521
    #14 0x7fa1487ccec4 (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)
    #15 0x401d58 in _start (/home/tsdgeos/devel/poppler/build-debug/utils/pdftoppm+0x401d58)
Fix error reported by ASAN in 590.asan.0.7288.pdf

==31898== ERROR: AddressSanitizer: heap-use-after-free on address 0x60ae0007432c at pc 0x7f03483026aa bp 0x7fff6ec0c820 sp 0x7fff6ec0c818
READ of size 4 at 0x60ae0007432c thread T0
    #0 0x7f03483026a9 in SplashFTFont::getGlyphPath(int) /home/tsdgeos/devel/poppler/splash/SplashFTFont.cc:414
    #1 0x7f034829f681 in SplashOutputDev::drawChar(GfxState*, double, double, double, double, double, double, unsigned int, int, unsigned int*, int) /home/tsdgeos/devel/poppler/poppler/SplashOutputDev.cc:2239
    #2 0x7f0348100599 in Gfx::doShowText(GooString*) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:4054
    #3 0x7f03480fddb0 in Gfx::opShowSpaceText(Object*, int) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:3886
    #4 0x7f03480dc33a in Gfx::execOp(Object*, Object*, int) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:903
    #5 0x7f03480db50f in Gfx::go(bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:762
    #6 0x7f03480db163 in Gfx::display(Object*, bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:728
    #7 0x7f03481bddd1 in Page::displaySlice(OutputDev*, double, double, int, bool, bool, int, int, int, int, bool, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/Page.cc:585
    #8 0x7f03481c52fd in PDFDoc::displayPageSlice(OutputDev*, int, double, double, int, bool, bool, bool, int, int, int, int, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/PDFDoc.cc:503
    #9 0x40311e in savePageSlice(PDFDoc*, SplashOutputDev*, int, int, int, int, int, double, double, char*) /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:222
    #10 0x404416 in main /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:521
    #11 0x7f03477e5ec4 (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)
    #12 0x401d58 in _start (/home/tsdgeos/devel/poppler/build-debug/utils/pdftoppm+0x401d58)
Fix error reported by ASAN in 5782.asan.0.7113.pdf

==32161== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6008000e3bcf at pc 0x7f66bae0e117 bp 0x7fffcb54ea70 sp 0x7fffcb54ea68
READ of size 1 at 0x6008000e3bcf thread T0
    #0 0x7f66bae0e116 in GooString::getChar(int) /home/tsdgeos/devel/poppler/goo/GooString.h:119
    #1 0x7f66bafb5dca in LinkURI::LinkURI(Object*, GooString*) /home/tsdgeos/devel/poppler/poppler/Link.cc:562
    #2 0x7f66bafb2a05 in LinkAction::parseAction(Object*, GooString*) /home/tsdgeos/devel/poppler/poppler/Link.cc:98
    #3 0x7f66bae69c0e in AnnotLink::initialize(PDFDoc*, Dict*) /home/tsdgeos/devel/poppler/poppler/Annot.cc:2621
    #4 0x7f66bae698d9 in AnnotLink::AnnotLink(PDFDoc*, Dict*, Object*) /home/tsdgeos/devel/poppler/poppler/Annot.cc:2596
    #5 0x7f66bae8d998 in Annots::createAnnot(Dict*, Object*) /home/tsdgeos/devel/poppler/poppler/Annot.cc:6737
    #6 0x7f66bae8d269 in Annots::Annots(PDFDoc*, int, Object*) /home/tsdgeos/devel/poppler/poppler/Annot.cc:6683
    #7 0x7f66bafc750d in Page::getAnnots(XRef*) /home/tsdgeos/devel/poppler/poppler/Page.cc:402
    #8 0x7f66bafc8e66 in Page::displaySlice(OutputDev*, double, double, int, bool, bool, int, int, int, int, bool, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/Page.cc:595
    #9 0x7f66bafd02fd in PDFDoc::displayPageSlice(OutputDev*, int, double, double, int, bool, bool, bool, int, int, int, int, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/PDFDoc.cc:503
    #10 0x40311e in savePageSlice(PDFDoc*, SplashOutputDev*, int, int, int, int, int, double, double, char*) /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:222
    #11 0x404416 in main /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:521
    #12 0x7f66ba5f0ec4 (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)
    #13 0x401d58 in _start (/home/tsdgeos/devel/poppler/build-debug/utils/pdftoppm+0x401d58)
Fix error reported by ASAN in 3628.asan.0.3910.pdf

==20743== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60040005c6ef at pc 0x7f8912ca0c90 bp 0x7fff8509ee20 sp 0x7fff8509ee18
READ of size 1 at 0x60040005c6ef thread T0
    #0 0x7f8912ca0c8f in expandRow(unsigned char*, unsigned char*, int, int, int) /home/tsdgeos/devel/poppler/splash/Splash.cc:4855
    #1 0x7f8912ca1097 in Splash::scaleImageYuXuBilinear(bool (*)(void*, unsigned char*, unsigned char*), void*, SplashColorMode, int, bool, int, int, int, int, SplashBitmap*) /home/tsdgeos/devel/poppler/splash/Splash.cc:4897
    #2 0x7f8912c9d2b7 in Splash::scaleImage(bool (*)(void*, unsigned char*, unsigned char*), void*, SplashColorMode, int, bool, int, int, int, int, bool, bool) /home/tsdgeos/devel/poppler/splash/Splash.cc:4127
    #3 0x7f8912c98101 in Splash::drawImage(bool (*)(void*, unsigned char*, unsigned char*), void*, SplashColorMode, bool, int, int, double*, bool, bool) /home/tsdgeos/devel/poppler/splash/Splash.cc:3726
    #4 0x7f8912c7056a in SplashOutputDev::drawSoftMaskedImage(GfxState*, Object*, Stream*, int, int, GfxImageColorMap*, bool, Stream*, int, int, GfxImageColorMap*, bool) /home/tsdgeos/devel/poppler/poppler/SplashOutputDev.cc:3630
    #5 0x7f8912ac7aa7 in Gfx::doImage(Object*, Stream*, bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:4646
    #6 0x7f8912ac4de0 in Gfx::opXObject(Object*, int) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:4179
    #7 0x7f8912a9f33a in Gfx::execOp(Object*, Object*, int) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:903
    #8 0x7f8912a9e50f in Gfx::go(bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:762
    #9 0x7f8912a9e163 in Gfx::display(Object*, bool) /home/tsdgeos/devel/poppler/poppler/Gfx.cc:728
    #10 0x7f8912b80e13 in Page::displaySlice(OutputDev*, double, double, int, bool, bool, int, int, int, int, bool, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/Page.cc:585
    #11 0x7f8912b8833f in PDFDoc::displayPageSlice(OutputDev*, int, double, double, int, bool, bool, bool, int, int, int, int, bool (*)(void*), void*, bool (*)(Annot*, void*), void*, bool) /home/tsdgeos/devel/poppler/poppler/PDFDoc.cc:503
    #12 0x40311e in savePageSlice(PDFDoc*, SplashOutputDev*, int, int, int, int, int, double, double, char*) /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:222
    #13 0x404416 in main /home/tsdgeos/devel/poppler/utils/pdftoppm.cc:521
    #14 0x7f89121a8ec4 (/lib/x86_64-linux-gnu/libc.so.6+0x21ec4)
    #15 0x401d58 in _start (/home/tsdgeos/devel/poppler/build-debug/utils/pdftoppm+0x401d58)