patch 8.0.0344: unlet command leaks memory commit https://github.com/vim/vim/commit/49439c4cdf7d2822255f292adda4226656fe144d Author: Bram Moolenaar <Bram@vim.org> Date: Mon Feb 20 23:07:05 2017 +0100 patch 8.0.0344: unlet command leaks memory Problem: Unlet command leaks memory. (Nikolai Pavlov) Solution: Free the memory on error. (closes https://github.com/vim/vim/issues/1497)

--- a/src/eval.c
+++ b/src/eval.c
@@ -2079,7 +2079,10 @@ get_lval(
 	    }
 	    /* existing variable, need to check if it can be changed */
 	    else if (var_check_ro(lp->ll_di->di_flags, name, FALSE))
+	    {
+		clear_tv(&var1);
 		return NULL;
+	    }
 
 	    if (len == -1)
 		clear_tv(&var1);