commit b1fc0b1f21c4082d24d1f456a846b4fa7d16a70b
author Alan Cox <alan@lxorguk.ukuu.org.uk> Mon Sep 25 23:33:08 2006 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> Tue Sep 26 08:49:09 2006 -0700
tree a2568be1bfd435ffcc398357577e8556b34a6fb9
parent 75e29b18d9a46bf3193278e92dc95609a8cca2ab

[PATCH] UML: tty locking

Ensure current->signal->tty doesn't get freed during log_exec().

Signed-off-by: Alan Cox <alan@redhat.com>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/kernel/exec.c

diff --git a/arch/um/kernel/exec.c b/arch/um/kernel/exec.c
index fc38a6d..0561c43 100644
--- a/arch/um/kernel/exec.c
+++ b/arch/um/kernel/exec.c
@@ -41,9 +41,11 @@
         long error;
 
 #ifdef CONFIG_TTY_LOG
-	task_lock(current);
+	mutex_lock(&tty_mutex);
+	task_lock(current);	/* FIXME:  is this needed ? */
 	log_exec(argv, current->signal->tty);
 	task_unlock(current);
+	mutex_unlock(&tty_mutex);
 #endif
         error = do_execve(file, argv, env, &current->thread.regs);
         if (error == 0){