Revert "daemon: Fix possible use-after-free."

This reverts commit 1303a4a4517260def862ce7fe97e6b28dd8005e1.

2 files changed, 6 insertions, 19 deletions

diff --git a/nix/libutil/util.cc b/nix/libutil/util.cc
index 024cea83d1..846674a29d 100644
--- a/nix/libutil/util.cc
+++ b/nix/libutil/util.cc
@@ -852,20 +852,16 @@ void killUser(uid_t uid)
 //////////////////////////////////////////////////////////////////////
 
 
-std::vector<const char *> stringsToCharPtrs(const Strings & ss)
-{
-    std::vector<const char *> res;
-    foreach (Strings::const_iterator, i, ss)
-        res.push_back(i->c_str());
-    res.push_back(0);
-    return res;
-}
-
-
 string runProgram(Path program, bool searchPath, const Strings & args)
 {
     checkInterrupt();
 
+    std::vector<const char *> cargs; /* careful with c_str()! */
+    cargs.push_back(program.c_str());
+    for (Strings::const_iterator i = args.begin(); i != args.end(); ++i)
+        cargs.push_back(i->c_str());
+    cargs.push_back(0);
+
     /* Create a pipe. */
     Pipe pipe;
     pipe.create();
@@ -884,10 +880,6 @@ string runProgram(Path program, bool searchPath, const Strings & args)
             if (dup2(pipe.writeSide, STDOUT_FILENO) == -1)
                 throw SysError("dupping stdout");
 
-	    Strings args_(args);
-	    args_.push_front(program);
-	    auto cargs = stringsToCharPtrs(args_);
-
             if (searchPath)
                 execvp(program.c_str(), (char * *) &cargs[0]);
             else
diff --git a/nix/libutil/util.hh b/nix/libutil/util.hh
index a70981877b..ce2d77c19a 100644
--- a/nix/libutil/util.hh
+++ b/nix/libutil/util.hh
@@ -257,11 +257,6 @@ void killUser(uid_t uid);
 string runProgram(Path program, bool searchPath = false,
     const Strings & args = Strings());
 
-/* Convert a list of strings to a null-terminated vector of char
-   *'s. The result must not be accessed beyond the lifetime of the
-   list of strings. */
-std::vector<const char *> stringsToCharPtrs(const Strings & ss);
-
 /* Close all file descriptors except stdin, stdout, stderr, and those
    listed in the given set.  Good practice in child processes. */
 void closeMostFDs(const set<int> & exceptions);