123 lines
3.8 KiB
Diff
123 lines
3.8 KiB
Diff
![]() |
From c812d1c1935cccf096a60ad904e640fdc83bd41c Mon Sep 17 00:00:00 2001
|
||
|
From: Adrian Johnson <ajohnson@redneon.com>
|
||
|
Date: Thu, 20 Oct 2016 21:12:30 +1030
|
||
|
Subject: [PATCH] image: prevent invalid ptr access for > 4GB images
|
||
|
|
||
|
Image data is often accessed using:
|
||
|
|
||
|
image->data + y * image->stride
|
||
|
|
||
|
On 64-bit achitectures if the image data is > 4GB, this computation
|
||
|
will overflow since both y and stride are 32-bit types.
|
||
|
|
||
|
https://bugs.freedesktop.org/show_bug.cgi?id=98165
|
||
|
---
|
||
|
boilerplate/cairo-boilerplate.c | 4 +++-
|
||
|
src/cairo-image-compositor.c | 4 ++--
|
||
|
src/cairo-image-surface-private.h | 2 +-
|
||
|
src/cairo-mesh-pattern-rasterizer.c | 2 +-
|
||
|
src/cairo-png.c | 2 +-
|
||
|
src/cairo-script-surface.c | 3 ++-
|
||
|
6 files changed, 10 insertions(+), 7 deletions(-)
|
||
|
|
||
|
diff --git a/boilerplate/cairo-boilerplate.c b/boilerplate/cairo-boilerplate.c
|
||
|
index 7fdbf79..4804dea 100644
|
||
|
--- a/boilerplate/cairo-boilerplate.c
|
||
|
+++ b/boilerplate/cairo-boilerplate.c
|
||
|
@@ -42,6 +42,7 @@
|
||
|
#undef CAIRO_VERSION_H
|
||
|
#include "../cairo-version.h"
|
||
|
|
||
|
+#include <stddef.h>
|
||
|
#include <stdlib.h>
|
||
|
#include <ctype.h>
|
||
|
#include <assert.h>
|
||
|
@@ -976,7 +977,8 @@ cairo_surface_t *
|
||
|
cairo_boilerplate_image_surface_create_from_ppm_stream (FILE *file)
|
||
|
{
|
||
|
char format;
|
||
|
- int width, height, stride;
|
||
|
+ int width, height;
|
||
|
+ ptrdiff_t stride;
|
||
|
int x, y;
|
||
|
unsigned char *data;
|
||
|
cairo_surface_t *image = NULL;
|
||
|
diff --git a/src/cairo-image-compositor.c b/src/cairo-image-compositor.c
|
||
|
index 48072f8..3ca0006 100644
|
||
|
--- a/src/cairo-image-compositor.c
|
||
|
+++ b/src/cairo-image-compositor.c
|
||
|
@@ -1575,7 +1575,7 @@ typedef struct _cairo_image_span_renderer {
|
||
|
pixman_image_t *src, *mask;
|
||
|
union {
|
||
|
struct fill {
|
||
|
- int stride;
|
||
|
+ ptrdiff_t stride;
|
||
|
uint8_t *data;
|
||
|
uint32_t pixel;
|
||
|
} fill;
|
||
|
@@ -1594,7 +1594,7 @@ typedef struct _cairo_image_span_renderer {
|
||
|
struct finish {
|
||
|
cairo_rectangle_int_t extents;
|
||
|
int src_x, src_y;
|
||
|
- int stride;
|
||
|
+ ptrdiff_t stride;
|
||
|
uint8_t *data;
|
||
|
} mask;
|
||
|
} u;
|
||
|
diff --git a/src/cairo-image-surface-private.h b/src/cairo-image-surface-private.h
|
||
|
index 8ca694c..7e78d61 100644
|
||
|
--- a/src/cairo-image-surface-private.h
|
||
|
+++ b/src/cairo-image-surface-private.h
|
||
|
@@ -71,7 +71,7 @@ struct _cairo_image_surface {
|
||
|
|
||
|
int width;
|
||
|
int height;
|
||
|
- int stride;
|
||
|
+ ptrdiff_t stride;
|
||
|
int depth;
|
||
|
|
||
|
unsigned owns_data : 1;
|
||
|
diff --git a/src/cairo-mesh-pattern-rasterizer.c b/src/cairo-mesh-pattern-rasterizer.c
|
||
|
index 1b63ca8..e7f0db6 100644
|
||
|
--- a/src/cairo-mesh-pattern-rasterizer.c
|
||
|
+++ b/src/cairo-mesh-pattern-rasterizer.c
|
||
|
@@ -470,7 +470,7 @@ draw_pixel (unsigned char *data, int width, int height, int stride,
|
||
|
tg += tg >> 16;
|
||
|
tb += tb >> 16;
|
||
|
|
||
|
- *((uint32_t*) (data + y*stride + 4*x)) = ((ta << 16) & 0xff000000) |
|
||
|
+ *((uint32_t*) (data + y*(ptrdiff_t)stride + 4*x)) = ((ta << 16) & 0xff000000) |
|
||
|
((tr >> 8) & 0xff0000) | ((tg >> 16) & 0xff00) | (tb >> 24);
|
||
|
}
|
||
|
}
|
||
|
diff --git a/src/cairo-png.c b/src/cairo-png.c
|
||
|
index 562b743..aa8c227 100644
|
||
|
--- a/src/cairo-png.c
|
||
|
+++ b/src/cairo-png.c
|
||
|
@@ -673,7 +673,7 @@ read_png (struct png_read_closure_t *png_closure)
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < png_height; i++)
|
||
|
- row_pointers[i] = &data[i * stride];
|
||
|
+ row_pointers[i] = &data[i * (ptrdiff_t)stride];
|
||
|
|
||
|
png_read_image (png, row_pointers);
|
||
|
png_read_end (png, info);
|
||
|
diff --git a/src/cairo-script-surface.c b/src/cairo-script-surface.c
|
||
|
index ea0117d..91e4baa 100644
|
||
|
--- a/src/cairo-script-surface.c
|
||
|
+++ b/src/cairo-script-surface.c
|
||
|
@@ -1202,7 +1202,8 @@ static cairo_status_t
|
||
|
_write_image_surface (cairo_output_stream_t *output,
|
||
|
const cairo_image_surface_t *image)
|
||
|
{
|
||
|
- int stride, row, width;
|
||
|
+ int row, width;
|
||
|
+ ptrdiff_t stride;
|
||
|
uint8_t row_stack[CAIRO_STACK_BUFFER_SIZE];
|
||
|
uint8_t *rowdata;
|
||
|
uint8_t *data;
|
||
|
--
|
||
|
2.1.4
|
||
|
|