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irda: Fix memory leak caused by repeated binds of irda socket

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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: 1da177e4c3 ("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>
This commit is contained in:
Tyler Hicks 2018-09-04 15:24:04 +00:00 • committed by Greg Kroah-Hartman
parent accf294af4
commit 4a7811bb3a
1 changed files with 7 additions and 0 deletions
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7
net/irda/af_irda.c
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@ -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) &&