limit \numexpr recusion by expand_depth, like \number (from phelype)

git-svn-id: svn://tug.org/texlive/trunk@57850 c570f23f-e606-0410-a88d-b1316a301751

6 files changed, 21 insertions, 0 deletions

diff --git a/Build/source/texk/web2c/etexdir/ChangeLog b/Build/source/texk/web2c/etexdir/ChangeLog
index 5d6d225d293..4a71c7f3cc0 100644
--- a/Build/source/texk/web2c/etexdir/ChangeLog
+++ b/Build/source/texk/web2c/etexdir/ChangeLog
@@ -1,3 +1,7 @@
+2021-02-22  Phelype Oleinik  <phe.h.o1@gmail.com>
+
+	* etex.ch: avoid "expansion depth" overflow with \numexpr.
+
 2021-02-13  Karl Berry  <karl@freefriends.org>
 
 	* am/etex.am (etex_ch_srcs): adjust for split enctex changes.
diff --git a/Build/source/texk/web2c/etexdir/etex.ch b/Build/source/texk/web2c/etexdir/etex.ch
index cf0d56c6479..d6363552633 100644
--- a/Build/source/texk/web2c/etexdir/etex.ch
+++ b/Build/source/texk/web2c/etexdir/etex.ch
@@ -5017,7 +5017,10 @@ var a,@!b:boolean; {saved values of |arith_error|}
 @!p:pointer; {top of expression stack}
 @!q:pointer; {for stack manipulations}
 begin l:=cur_val_level; a:=arith_error; b:=false; p:=null;
+incr(expand_depth_count);
+if expand_depth_count>=expand_depth then overflow("expansion depth",expand_depth);
 @<Scan and evaluate an expression |e| of type |l|@>;
+decr(expand_depth_count);
 if b then
   begin print_err("Arithmetic overflow");
 @.Arithmetic overflow@>
diff --git a/Build/source/texk/web2c/pdftexdir/ChangeLog b/Build/source/texk/web2c/pdftexdir/ChangeLog
index dc6402658e7..1506fd30a9e 100644
--- a/Build/source/texk/web2c/pdftexdir/ChangeLog
+++ b/Build/source/texk/web2c/pdftexdir/ChangeLog
@@ -1,3 +1,7 @@
+2021-02-22  Phelype Oleinik  <phe.h.o1@gmail.com>
+
+	* eobase.ch: avoid "expansion depth" overflow with \numexpr.
+
 2021-02-17  Karl Berry  <karl@tug.org>
 
         * NEWS,
diff --git a/Build/source/texk/web2c/pdftexdir/pdftex.web b/Build/source/texk/web2c/pdftexdir/pdftex.web
index 848b37976d7..4ae1f20716f 100644
--- a/Build/source/texk/web2c/pdftexdir/pdftex.web
+++ b/Build/source/texk/web2c/pdftexdir/pdftex.web
@@ -38618,7 +38618,10 @@ var a,@!b:boolean; {saved values of |arith_error|}
 @!p:pointer; {top of expression stack}
 @!q:pointer; {for stack manipulations}
 begin l:=cur_val_level; a:=arith_error; b:=false; p:=null;
+incr(expand_depth_count);
+if expand_depth_count>=expand_depth then overflow("expansion depth",expand_depth);
 @<Scan and evaluate an expression |e| of type |l|@>;
+decr(expand_depth_count);
 if b then
   begin print_err("Arithmetic overflow");
 @.Arithmetic overflow@>
diff --git a/Build/source/texk/web2c/xetexdir/ChangeLog b/Build/source/texk/web2c/xetexdir/ChangeLog
index d68c003cc16..cfbdeaf80a9 100644
--- a/Build/source/texk/web2c/xetexdir/ChangeLog
+++ b/Build/source/texk/web2c/xetexdir/ChangeLog
@@ -1,3 +1,7 @@
+2021-02-22  Phelype Oleinik  <phe.h.o1@gmail.com>
+
+	* eobase.ch: avoid "expansion depth" overflow with \numexpr.
+
 2021-02-17  Karl Berry  <karl@tug.org>
 
         * NEWS,
diff --git a/Build/source/texk/web2c/xetexdir/xetex.web b/Build/source/texk/web2c/xetexdir/xetex.web
index 04e00da0152..8aa90220eb4 100644
--- a/Build/source/texk/web2c/xetexdir/xetex.web
+++ b/Build/source/texk/web2c/xetexdir/xetex.web
@@ -32966,7 +32966,10 @@ var a,@!b:boolean; {saved values of |arith_error|}
 @!p:pointer; {top of expression stack}
 @!q:pointer; {for stack manipulations}
 begin l:=cur_val_level; a:=arith_error; b:=false; p:=null;
+incr(expand_depth_count);
+if expand_depth_count>=expand_depth then overflow("expansion depth",expand_depth);
 @<Scan and evaluate an expression |e| of type |l|@>;
+decr(expand_depth_count);
 if b then
   begin print_err("Arithmetic overflow");
 @.Arithmetic overflow@>