[psaux] Fix integer overflow.
Reported as
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30154
* src/psaux/psblues.c (cf2_blues_capture): Use `SUB_INT32`.
diff --git a/ChangeLog b/ChangeLog
index f1a2106..4f4af4e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2021-02-03 Werner Lemberg <wl@gnu.org>
+
+ [psaux] Fix integer overflow.
+
+ Reported as
+
+ https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30154
+
+ * src/psaux/psblues.c (cf2_blues_capture): Use `SUB_INT32`.
+
2021-02-02 Alexei Podtelezhnikov <apodtele@gmail.com>
* builds/unix/configure.raw [mmap support]: Explicitly handle Windows.
diff --git a/src/psaux/psblues.c b/src/psaux/psblues.c
index 3878e9b..7bfd419 100644
--- a/src/psaux/psblues.c
+++ b/src/psaux/psblues.c
@@ -506,7 +506,8 @@
/* guarantee minimum of 1 pixel overshoot */
dsNew = FT_MIN(
cf2_fixedRound( bottomHintEdge->dsCoord ),
- blues->zone[i].dsFlatEdge - cf2_intToFixed( 1 ) );
+ SUB_INT32 ( blues->zone[i].dsFlatEdge,
+ cf2_intToFixed( 1 ) ) );
}
else
