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-rw-r--r--ChangeLog5
-rw-r--r--Src/math.c3
2 files changed, 6 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog
index 55fdd95eb..f390032d5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -11,6 +11,9 @@
 	* unposted: Doc/Zsh/params.yo: Document that PROMPT_EOL_MARK can
 	be empty, forgot in 28480.
 
+	* 29329: Src/math.c: Fix undefined behaviour in function argument
+	evaluation order.
+
 2011-05-26  Peter Stephenson  <pws@csr.com>
 
 	* unposted: Etc/CONTRIBUTORS: expand.
@@ -14840,5 +14843,5 @@
 
 *****************************************************
 * This is used by the shell to define $ZSH_PATCHLEVEL
-* $Revision: 1.5335 $
+* $Revision: 1.5336 $
 *****************************************************
diff --git a/Src/math.c b/Src/math.c
index 377d1ac9c..beef74525 100644
--- a/Src/math.c
+++ b/Src/math.c
@@ -1156,7 +1156,8 @@ op(int what)
 	if (tp & (OP_E2|OP_E2IO)) {
 	    struct mathvalue *mvp = stack + sp + 1;
 	    lv = stack[sp+1].lval;
-	    push(setmathvar(mvp,c), mvp->lval, 0);
+	    c = setmathvar(mvp, c);
+	    push(c, mvp->lval, 0);
 	} else
 	    push(c,NULL, 0);
 	return;