[PATCH] fix task_struct leak in ptrace

When ptrace_attach fails we need to drop the task_struct reference.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

kernel/ptrace.c

@@ -470,7 +470,7 @@ asmlinkage long sys_ptrace(long request, long pid, long addr, long data)
 
 	if (request == PTRACE_ATTACH) {
 		ret = ptrace_attach(child);
-		goto out;
+		goto out_put_task_struct;
 	}
 
 	ret = ptrace_check_attach(child, request == PTRACE_KILL);