diff options
| author | Tyler Hicks <tyhicks@canonical.com> | 2018-09-04 15:24:04 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-15 09:43:01 +0200 |
| commit | ce54bf4aec595c479b462180d682783b3776fb80 (patch) | |
| tree | 2cd13b00b4522cec665dfcf5ab947b6c3cd42ce8 | |
| parent | a75228044ef6f99b057784d46b98df0cd0dd8a5b (diff) | |
| download | linux-stable-ce54bf4aec595c479b462180d682783b3776fb80.tar.gz linux-stable-ce54bf4aec595c479b462180d682783b3776fb80.tar.bz2 linux-stable-ce54bf4aec595c479b462180d682783b3776fb80.zip | |
irda: Fix memory leak caused by repeated binds of irda socket
The irda_bind() function allocates memory for self->ias_obj without
checking to see if the socket is already bound. A userspace process
could repeatedly bind the socket, have each new object added into the
LM-IAS database, and lose the reference to the old object assigned to
the socket to exhaust memory resources. This patch errors out of the
bind operation when self->ias_obj is already assigned.
CVE-2018-6554
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reviewed-by: Seth Arnold <seth.arnold@canonical.com>
Reviewed-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/irda/af_irda.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/net/irda/af_irda.c b/net/irda/af_irda.c index 101ed6c42808..b85fa22806f6 100644 --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -774,6 +774,13 @@ static int irda_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) return -EINVAL; lock_sock(sk); + + /* Ensure that the socket is not already bound */ + if (self->ias_obj) { + err = -EINVAL; + goto out; + } + #ifdef CONFIG_IRDA_ULTRA /* Special care for Ultra sockets */ if ((sk->sk_type == SOCK_DGRAM) && |