[patch 16/37] NET: Fix sock_attach_fd() failure in sys_accept()

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Alexey Dobriyan <adobriyan@xxxxx>

[NET]: Correct accept(2) recovery after sock_attach_fd()

* d_alloc() in sock_attach_fd() fails leaving ->f_dentry of new file NULL
* bail out to out_fd label, doing fput()/__fput() on new file
* but __fput() assumes valid ->f_dentry and dereferences it

Signed-off-by: Alexey Dobriyan <adobriyan@xxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/socket.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/socket.c
+++ b/net/socket.c
@@ -1368,7 +1368,7 @@ asmlinkage long sys_accept(int fd, struc
 
 	err = sock_attach_fd(newsock, newfile);
 	if (err < 0)
-		goto out_fd;
+		goto out_fd_simple;
 
 	err = security_socket_accept(sock, newsock);
 	if (err)
@@ -1401,6 +1401,11 @@ out_put:
 	fput_light(sock->file, fput_needed);
 out:
 	return err;
+out_fd_simple:
+	sock_release(newsock);
+	put_filp(newfile);
+	put_unused_fd(newfd);
+	goto out_put;
 out_fd:
 	fput(newfile);
 	put_unused_fd(newfd);

-- 
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