forcepoint#55 invalid iterator increment

Change-Id: I151602f645a48404d93e0ae64a9e1d2a6ba2bc4b
Reviewed-on: https://gerrit.libreoffice.org/58384
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/sc/source/core/data/column3.cxx b/sc/source/core/data/column3.cxx
index b8b5acd28a3c..9a1a5622a608 100644
--- a/sc/source/core/data/column3.cxx
+++ b/sc/source/core/data/column3.cxx
@@ -3081,6 +3081,8 @@ public:
                 if (xCurGrp)
                 {
                     // Move to the cell after the last cell of the current group.
+                    if (xCurGrp->mnLength > std::distance(it, itEnd))
+                        throw css::lang::IllegalArgumentException();
                     std::advance(it, xCurGrp->mnLength);
                     nRow += xCurGrp->mnLength;
                 }