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| author | dsinclair <dsinclair@chromium.org> | 2016-08-09 06:50:28 -0700 |
|---|---|---|
| committer | Commit bot <commit-bot@chromium.org> | 2016-08-09 06:50:28 -0700 |
| commit | fb362089d952950212ccf159f86a46923f223172 (patch) | |
| tree | 23692bebb1dc91a8b2998663336ec7902f540845 /third_party/agg23/agg_clip_liang_barsky.h | |
| parent | 5d8e5aa882fe8d37d32b71137f039165581ddb82 (diff) | |
| download | pdfium-fb362089d952950212ccf159f86a46923f223172.tar.xz | |
Fixup various overflow conditions
There were several overflows detected by the PDF from the linked bug. This
Cl fixes up the base causes of each of them.
BUG=chromium:635473
Review-Url: https://codereview.chromium.org/2226023002
Diffstat (limited to 'third_party/agg23/agg_clip_liang_barsky.h')
| -rw-r--r-- | third_party/agg23/agg_clip_liang_barsky.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/third_party/agg23/agg_clip_liang_barsky.h b/third_party/agg23/agg_clip_liang_barsky.h index db6ca97505..5b1261f004 100644 --- a/third_party/agg23/agg_clip_liang_barsky.h +++ b/third_party/agg23/agg_clip_liang_barsky.h @@ -20,6 +20,7 @@ #ifndef AGG_CLIP_LIANG_BARSKY_INCLUDED #define AGG_CLIP_LIANG_BARSKY_INCLUDED #include "agg_basics.h" +#include "third_party/base/numerics/safe_math.h" namespace agg { template<class T> @@ -36,8 +37,18 @@ inline unsigned clip_liang_barsky(T x1, T y1, T x2, T y2, T* x, T* y) { const FX_FLOAT nearzero = 1e-30f; - FX_FLOAT deltax = (FX_FLOAT)(x2 - x1); - FX_FLOAT deltay = (FX_FLOAT)(y2 - y1); + + pdfium::base::CheckedNumeric<FX_FLOAT> width = x2; + width -= x1; + if (!width.IsValid()) + return 0; + pdfium::base::CheckedNumeric<FX_FLOAT> height = y2; + height -= y1; + if (!height.IsValid()) + return 0; + + FX_FLOAT deltax = width.ValueOrDefault(0); + FX_FLOAT deltay = height.ValueOrDefault(0); unsigned np = 0; if(deltax == 0) { deltax = (x1 > clip_box.x1) ? -nearzero : nearzero; |