[gnumeric] Fix INTERPOLATION crash. [#680711]

[Andreas J. Guelzow <guelzow src gnome org>]

commit fb3475d93a02bf98516e04d0e04e6fed97296428
Author: Andreas J Guelzow <aguelzow pyrshep ca>
Date:   Fri Jul 27 12:10:28 2012 -0600

    Fix INTERPOLATION crash. [#680711]
    
    2012-07-27 Andreas J. Guelzow <aguelzow pyrshep ca>
    
    	* functions.c (gnumeric_interpolation): check for target size
    	after adjustment

 NEWS                       |    1 +
 plugins/fn-tsa/ChangeLog   |    5 +++++
 plugins/fn-tsa/functions.c |   12 ++++++------
 3 files changed, 12 insertions(+), 6 deletions(-)
---
diff --git a/NEWS b/NEWS
index 209e8a2..af2a9dd 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@ Andreas:
 	* Fix implicit ')' for array functions. [#680548]
 	* Add FLIP function. [#680511]
 	* Allow unordered abscissae in INTERPOLATION. [#680510]
+	* Fix INTERPOLATION crash. [#680711]
 
 Jean:
 	* Fix component references issues. [#680190]
diff --git a/plugins/fn-tsa/ChangeLog b/plugins/fn-tsa/ChangeLog
index aa37b37..932f6e7 100644
--- a/plugins/fn-tsa/ChangeLog
+++ b/plugins/fn-tsa/ChangeLog
@@ -1,5 +1,10 @@
 2012-07-27 Andreas J. Guelzow <aguelzow pyrshep ca>
 
+	* functions.c (gnumeric_interpolation): check for target size
+	after adjustment
+
+2012-07-27 Andreas J. Guelzow <aguelzow pyrshep ca>
+
 	* functions.c (gnumeric_interpolation): sort abscissae
 	if they are unordered
 	(help_interpolation): delete the requirement that abscissae
diff --git a/plugins/fn-tsa/functions.c b/plugins/fn-tsa/functions.c
index bfd78ba..5ba4947 100644
--- a/plugins/fn-tsa/functions.c
+++ b/plugins/fn-tsa/functions.c
@@ -432,12 +432,6 @@ gnumeric_interpolation (GnmFuncEvalInfo *ei, GnmValue const * const *argv)
 		return error;
 	}
 
-	if (n2 <= 0) {
-		g_slist_free (missing2);
-		g_free (vals2);
-		return value_new_error_std (ei->pos, GNM_ERROR_VALUE);
-	}
-
 	/* argv[3] */
 
 	if (argv[3]) {
@@ -474,6 +468,12 @@ gnumeric_interpolation (GnmFuncEvalInfo *ei, GnmValue const * const *argv)
 		break;
 	}
 
+	if (n2 <= 0) {
+		g_slist_free (missing2);
+		g_free (vals2);
+		return value_new_error_std (ei->pos, GNM_ERROR_VALUE);
+	}
+
 	/* argv[0] & argv[1] */
 
 	flags = COLLECT_IGNORE_BLANKS | COLLECT_IGNORE_STRINGS | COLLECT_IGNORE_BOOLS;