From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 18 Aug 2012 02:42:36 +0000 (-0400)
Subject: eventpoll: use-after-possible-free in epoll_create1()
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=98022748f6c7bce85b9f123fd4d1a621219dd8d9;p=~shefty%2Frdma-dev.git

eventpoll: use-after-possible-free in epoll_create1()

As soon as we'd installed the file into descriptor table, it can
get closed by another thread.  Freeing ep in process...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 1c8b5567080..eedec84c180 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1654,8 +1654,8 @@ SYSCALL_DEFINE1(epoll_create1, int, flags)
 		error = PTR_ERR(file);
 		goto out_free_fd;
 	}
-	fd_install(fd, file);
 	ep->file = file;
+	fd_install(fd, file);
 	return fd;
 
 out_free_fd: