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-rw-r--r--user/cairo/CVE-2020-35492.patch54
1 files changed, 54 insertions, 0 deletions
diff --git a/user/cairo/CVE-2020-35492.patch b/user/cairo/CVE-2020-35492.patch
new file mode 100644
index 000000000..d7369b3d6
--- /dev/null
+++ b/user/cairo/CVE-2020-35492.patch
@@ -0,0 +1,54 @@
+From 03a820b173ed1fdef6ff14b4468f5dbc02ff59be Mon Sep 17 00:00:00 2001
+From: Heiko Lewin <heiko.lewin@worldiety.de>
+Date: Tue, 15 Dec 2020 16:48:19 +0100
+Subject: [PATCH] Fix mask usage in image-compositor
+
+---
+ src/cairo-image-compositor.c | 8 ++--
+ test/Makefile.sources | 1 +
+ test/bug-image-compositor.c | 39 ++++++++++++++++++++
+ test/reference/bug-image-compositor.ref.png | Bin 0 -> 185 bytes
+ 4 files changed, 44 insertions(+), 4 deletions(-)
+ create mode 100644 test/bug-image-compositor.c
+ create mode 100644 test/reference/bug-image-compositor.ref.png
+
+diff --git a/src/cairo-image-compositor.c b/src/cairo-image-compositor.c
+index 79ad69f68..4f8aaed99 100644
+--- a/src/cairo-image-compositor.c
++++ b/src/cairo-image-compositor.c
+@@ -2610,14 +2610,14 @@ _inplace_src_spans (void *abstract_renderer, int y, int h,
+ unsigned num_spans)
+ {
+ cairo_image_span_renderer_t *r = abstract_renderer;
+- uint8_t *m;
++ uint8_t *m, *base = (uint8_t*)pixman_image_get_data(r->mask);
+ int x0;
+
+ if (num_spans == 0)
+ return CAIRO_STATUS_SUCCESS;
+
+ x0 = spans[0].x;
+- m = r->_buf;
++ m = base;
+ do {
+ int len = spans[1].x - spans[0].x;
+ if (len >= r->u.composite.run_length && spans[0].coverage == 0xff) {
+@@ -2655,7 +2655,7 @@ _inplace_src_spans (void *abstract_renderer, int y, int h,
+ spans[0].x, y,
+ spans[1].x - spans[0].x, h);
+
+- m = r->_buf;
++ m = base;
+ x0 = spans[1].x;
+ } else if (spans[0].coverage == 0x0) {
+ if (spans[0].x != x0) {
+@@ -2684,7 +2684,7 @@ _inplace_src_spans (void *abstract_renderer, int y, int h,
+ #endif
+ }
+
+- m = r->_buf;
++ m = base;
+ x0 = spans[1].x;
+ } else {
+ *m++ = spans[0].coverage;
+