diff options
| author | Tyler Hicks <tyhicks@canonical.com> | 2018-09-04 18:24:04 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 09:33:52 +0300 |
| commit | 9f0547e071f848a665056e18c70cc2741a96ca76 (patch) | |
| tree | 461cdd3ae49228400f0ecf837605677c5629f0aa /net/irda | |
| parent | 2daf1a7495833dad8ac2875906b471a0d55e6238 (diff) | |
| download | linux-9f0547e071f848a665056e18c70cc2741a96ca76.tar.xz | |
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>
Diffstat (limited to 'net/irda')
| -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 556e3b0f77ba..70a1fd69d4de 100644 --- a/net/irda/af_irda.c +++ b/net/irda/af_irda.c @@ -785,6 +785,13 @@ 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) && |