Fix safety crash when appending comments

[xboard.git] / backend.c

diff --git a/backend.c b/backend.c
index 6e544c0..a887fb6 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -13373,7 +13373,7 @@ if(appData.debugMode) fprintf(debugFP, "Append: in='%s' %d\n", text, addBraces);
        while(commentList[index][oldlen-1] ==  '\n')
          commentList[index][--oldlen] = NULLCHAR;
        commentList[index] = (char *) malloc(oldlen + len + 6); // might waste 4
-       safeStrCpy(commentList[index], old, oldlen);
+       safeStrCpy(commentList[index], old, oldlen + len + 6);
        free(old);
        // [HGM] braces: join "{A\n}\n" + "{\nB}" as "{A\nB\n}"
        if(commentList[index][oldlen-1] == '}' && (text[0] == '{' || addBraces)) {