Potential fix for a crash in llfontgl

1 files changed, 12 insertions, 6 deletions

diff --git a/linden/indra/llrender/llfontgl.cpp b/linden/indra/llrender/llfontgl.cpp
index beecb6b..5d3d6a7 100644
--- a/linden/indra/llrender/llfontgl.cpp
+++ b/linden/indra/llrender/llfontgl.cpp
@@ -725,17 +725,18 @@ F32 LLFontGL::getWidthF32(const std::string& utf8text, const S32 begin_offset, c
 
 F32 LLFontGL::getWidthF32(const llwchar* wchars, const S32 begin_offset, const S32 max_chars, BOOL use_embedded) const
 {
+        if (!wchars || !wchars[0] || max_chars == 0)
+        {
+                return 0;
+        }
+
         const S32 LAST_CHARACTER = LLFont::LAST_CHAR_FULL;
 
         F32 cur_x = 0;
         const S32 max_index = begin_offset + max_chars;
-        for (S32 i = begin_offset; i < max_index; i++)
+        for (S32 i = begin_offset; i < max_index && wchars[i] != 0; i++)
         {
-                const llwchar wch = wchars[i];
-                if (wch == 0)
-                {
-                        break; // done
-                }
+                llwchar wch = wchars[i];
                 const embedded_data_t* ext_data = use_embedded ? getEmbeddedCharData(wch) : NULL;
                 if (ext_data)
                 {
@@ -764,6 +765,11 @@ F32 LLFontGL::getWidthF32(const llwchar* wchars, const S32 begin_offset, const S
                 cur_x = (F32)llfloor(cur_x + 0.5f);
         }
 
+        if (cur_x == 0)
+        {
+                return cur_x;
+        }
+
         return cur_x / sScaleX;
 }