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-rw-r--r--third_party/agg23/0003-ubsan-render-line-error.patch73
-rw-r--r--third_party/agg23/README.pdfium1
-rw-r--r--third_party/agg23/agg_rasterizer_scanline_aa.cpp38
3 files changed, 98 insertions, 14 deletions
diff --git a/third_party/agg23/0003-ubsan-render-line-error.patch b/third_party/agg23/0003-ubsan-render-line-error.patch
new file mode 100644
index 0000000000..7bd3b70424
--- /dev/null
+++ b/third_party/agg23/0003-ubsan-render-line-error.patch
@@ -0,0 +1,73 @@
+diff --git a/third_party/agg23/agg_rasterizer_scanline_aa.cpp b/third_party/agg23/agg_rasterizer_scanline_aa.cpp
+index 46379f6..c6b3f01 100644
+--- a/third_party/agg23/agg_rasterizer_scanline_aa.cpp
++++ b/third_party/agg23/agg_rasterizer_scanline_aa.cpp
+@@ -48,6 +48,7 @@
+ //----------------------------------------------------------------------------
+ #include <limits.h>
+ #include "agg_rasterizer_scanline_aa.h"
++#include "third_party/base/numerics/safe_math.h"
+ namespace agg
+ {
+ AGG_INLINE void cell_aa::set_cover(int c, int a)
+@@ -237,7 +238,7 @@ void outline_aa::render_line(int x1, int y1, int x2, int y2)
+ int fy1 = y1 & poly_base_mask;
+ int fy2 = y2 & poly_base_mask;
+ int x_from, x_to;
+- int p, rem, mod, lift, delta, first, incr;
++ int rem, mod, lift, delta, first, incr;
+ if(ey1 == ey2) {
+ render_hline(ey1, x1, fy1, x2, fy2);
+ return;
+@@ -268,16 +269,22 @@ void outline_aa::render_line(int x1, int y1, int x2, int y2)
+ m_cur_cell.add_cover(delta, two_fx * delta);
+ return;
+ }
+- p = (poly_base_size - fy1) * dx;
++ pdfium::base::CheckedNumeric<int> safeP = poly_base_size - fy1;
++ safeP *= dx;
++ if (!safeP.IsValid())
++ return;
+ first = poly_base_size;
+ if(dy < 0) {
+- p = fy1 * dx;
+- first = 0;
+- incr = -1;
+- dy = -dy;
++ safeP = fy1;
++ safeP *= dx;
++ if (!safeP.IsValid())
++ return;
++ first = 0;
++ incr = -1;
++ dy = -dy;
+ }
+- delta = p / dy;
+- mod = p % dy;
++ delta = safeP.ValueOrDie() / dy;
++ mod = safeP.ValueOrDie() % dy;
+ if(mod < 0) {
+ delta--;
+ mod += dy;
+@@ -287,12 +294,15 @@ void outline_aa::render_line(int x1, int y1, int x2, int y2)
+ ey1 += incr;
+ set_cur_cell(x_from >> poly_base_shift, ey1);
+ if(ey1 != ey2) {
+- p = poly_base_size * dx;
+- lift = p / dy;
+- rem = p % dy;
+- if(rem < 0) {
+- lift--;
+- rem += dy;
++ safeP = static_cast<int>(poly_base_size);
++ safeP *= dx;
++ if (!safeP.IsValid())
++ return;
++ lift = safeP.ValueOrDie() / dy;
++ rem = safeP.ValueOrDie() % dy;
++ if (rem < 0) {
++ lift--;
++ rem += dy;
+ }
+ mod -= dy;
+ while(ey1 != ey2) {
diff --git a/third_party/agg23/README.pdfium b/third_party/agg23/README.pdfium
index 8e055d2079..4b1ff49146 100644
--- a/third_party/agg23/README.pdfium
+++ b/third_party/agg23/README.pdfium
@@ -15,3 +15,4 @@ Possibly more?
0001-gcc-warning.patch: Fix a GCC warning about both enumeral and
non-enumeral type in conditional.
0002-ubsan-error-fixes.path: Fix UBSan errors for overflows.
+0003-ubsan-render-line-error.patch: Fix UBSan overflow error in render_line.
diff --git a/third_party/agg23/agg_rasterizer_scanline_aa.cpp b/third_party/agg23/agg_rasterizer_scanline_aa.cpp
index 46379f6dfd..c6b3f013a0 100644
--- a/third_party/agg23/agg_rasterizer_scanline_aa.cpp
+++ b/third_party/agg23/agg_rasterizer_scanline_aa.cpp
@@ -48,6 +48,7 @@
//----------------------------------------------------------------------------
#include <limits.h>
#include "agg_rasterizer_scanline_aa.h"
+#include "third_party/base/numerics/safe_math.h"
namespace agg
{
AGG_INLINE void cell_aa::set_cover(int c, int a)
@@ -237,7 +238,7 @@ void outline_aa::render_line(int x1, int y1, int x2, int y2)
int fy1 = y1 & poly_base_mask;
int fy2 = y2 & poly_base_mask;
int x_from, x_to;
- int p, rem, mod, lift, delta, first, incr;
+ int rem, mod, lift, delta, first, incr;
if(ey1 == ey2) {
render_hline(ey1, x1, fy1, x2, fy2);
return;
@@ -268,16 +269,22 @@ void outline_aa::render_line(int x1, int y1, int x2, int y2)
m_cur_cell.add_cover(delta, two_fx * delta);
return;
}
- p = (poly_base_size - fy1) * dx;
+ pdfium::base::CheckedNumeric<int> safeP = poly_base_size - fy1;
+ safeP *= dx;
+ if (!safeP.IsValid())
+ return;
first = poly_base_size;
if(dy < 0) {
- p = fy1 * dx;
- first = 0;
- incr = -1;
- dy = -dy;
+ safeP = fy1;
+ safeP *= dx;
+ if (!safeP.IsValid())
+ return;
+ first = 0;
+ incr = -1;
+ dy = -dy;
}
- delta = p / dy;
- mod = p % dy;
+ delta = safeP.ValueOrDie() / dy;
+ mod = safeP.ValueOrDie() % dy;
if(mod < 0) {
delta--;
mod += dy;
@@ -287,12 +294,15 @@ void outline_aa::render_line(int x1, int y1, int x2, int y2)
ey1 += incr;
set_cur_cell(x_from >> poly_base_shift, ey1);
if(ey1 != ey2) {
- p = poly_base_size * dx;
- lift = p / dy;
- rem = p % dy;
- if(rem < 0) {
- lift--;
- rem += dy;
+ safeP = static_cast<int>(poly_base_size);
+ safeP *= dx;
+ if (!safeP.IsValid())
+ return;
+ lift = safeP.ValueOrDie() / dy;
+ rem = safeP.ValueOrDie() % dy;
+ if (rem < 0) {
+ lift--;
+ rem += dy;
}
mod -= dy;
while(ey1 != ey2) {