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| author | Nicolas Pena <npm@chromium.org> | 2017-10-23 14:24:06 -0400 |
|---|---|---|
| committer | Chromium commit bot <commit-bot@chromium.org> | 2017-10-23 22:40:14 +0000 |
| commit | ebdba614b9683ddd1d50e8960639bc54c9d4bb7a (patch) | |
| tree | 97ac6040c9a9e33d6381f23effd2ea54129c499a /core/fxcodec/jbig2/JBig2_TrdProc.cpp | |
| parent | c9d0bcccbd4cc460bb3e26f767eea2d33a5b48b6 (diff) | |
| download | pdfium-ebdba614b9683ddd1d50e8960639bc54c9d4bb7a.tar.xz | |
Fix some integer overflows in CJBig2_TRDProc
Bug: 649278
Change-Id: Ib9084f6d9bb7dc7bf3713faa22d3a26822a96681
Reviewed-on: https://pdfium-review.googlesource.com/16550
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Diffstat (limited to 'core/fxcodec/jbig2/JBig2_TrdProc.cpp')
| -rw-r--r-- | core/fxcodec/jbig2/JBig2_TrdProc.cpp | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/core/fxcodec/jbig2/JBig2_TrdProc.cpp b/core/fxcodec/jbig2/JBig2_TrdProc.cpp index d513637a9d..2724d1de49 100644 --- a/core/fxcodec/jbig2/JBig2_TrdProc.cpp +++ b/core/fxcodec/jbig2/JBig2_TrdProc.cpp @@ -249,10 +249,11 @@ std::unique_ptr<CJBig2_Image> CJBig2_TRDProc::decode_Arith( } auto SBREG = pdfium::MakeUnique<CJBig2_Image>(SBW, SBH); SBREG->fill(SBDEFPIXEL); - int32_t STRIPT; - if (!pIADT->decode(pArithDecoder, &STRIPT)) + int32_t INITIAL_STRIPT; + if (!pIADT->decode(pArithDecoder, &INITIAL_STRIPT)) return nullptr; + FX_SAFE_INT32 STRIPT = INITIAL_STRIPT; STRIPT *= SBSTRIPS; STRIPT = -STRIPT; int32_t FIRSTS = 0; @@ -287,7 +288,11 @@ std::unique_ptr<CJBig2_Image> CJBig2_TRDProc::decode_Arith( if (SBSTRIPS != 1) pIAIT->decode(pArithDecoder, &CURT); - int32_t TI = STRIPT + CURT; + FX_SAFE_INT32 SAFE_TI = STRIPT + CURT; + if (!SAFE_TI.IsValid()) + return nullptr; + + int32_t TI = SAFE_TI.ValueOrDie(); uint32_t IDI; pIAID->decode(pArithDecoder, &IDI); if (IDI >= SBNUMSYMS) |