From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Fabien Dessenne <fabien.dessenne@st.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 23/29] tty: fix NULL pointer issue when tty_port ops is not set
Date: Mon, 22 Apr 2019 15:48:42 -0400 [thread overview]
Message-ID: <20190422194848.13049-23-sashal@kernel.org> (raw)
In-Reply-To: <20190422194848.13049-1-sashal@kernel.org>
From: Fabien Dessenne <fabien.dessenne@st.com>
[ Upstream commit f4e68d58cf2b20a581759bbc7228052534652673 ]
Unlike 'client_ops' which is initialized to 'default_client_ops', the
port operations 'ops' may be left to NULL.
Check the 'ops' value before checking the 'ops->x' value.
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
---
drivers/tty/tty_port.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 7f2f20b74d1d..06ba9dbbd610 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -213,7 +213,7 @@ static void tty_port_shutdown(struct tty_port *port, struct tty_struct *tty)
if (tty && C_HUPCL(tty))
tty_port_lower_dtr_rts(port);
- if (port->ops->shutdown)
+ if (port->ops && port->ops->shutdown)
port->ops->shutdown(port);
}
out:
@@ -293,7 +293,7 @@ EXPORT_SYMBOL_GPL(tty_port_tty_wakeup);
int tty_port_carrier_raised(struct tty_port *port)
{
- if (port->ops->carrier_raised == NULL)
+ if (!port->ops || !port->ops->carrier_raised)
return 1;
return port->ops->carrier_raised(port);
}
@@ -310,7 +310,7 @@ EXPORT_SYMBOL(tty_port_carrier_raised);
void tty_port_raise_dtr_rts(struct tty_port *port)
{
- if (port->ops->dtr_rts)
+ if (port->ops && port->ops->dtr_rts)
port->ops->dtr_rts(port, 1);
}
EXPORT_SYMBOL(tty_port_raise_dtr_rts);
@@ -326,7 +326,7 @@ EXPORT_SYMBOL(tty_port_raise_dtr_rts);
void tty_port_lower_dtr_rts(struct tty_port *port)
{
- if (port->ops->dtr_rts)
+ if (port->ops && port->ops->dtr_rts)
port->ops->dtr_rts(port, 0);
}
EXPORT_SYMBOL(tty_port_lower_dtr_rts);
@@ -582,7 +582,7 @@ int tty_port_open(struct tty_port *port, struct tty_struct *tty,
if (!tty_port_initialized(port)) {
clear_bit(TTY_IO_ERROR, &tty->flags);
- if (port->ops->activate) {
+ if (port->ops && port->ops->activate) {
int retval = port->ops->activate(port, tty);
if (retval) {
mutex_unlock(&port->mutex);
--
2.19.1
next prev parent reply other threads:[~2019-04-22 19:49 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-22 19:48 [PATCH AUTOSEL 4.9 01/29] ARM: dts: bcm283x: Fix hdmi hpd gpio pull Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 02/29] s390: limit brk randomization to 32MB Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 03/29] qlcnic: Avoid potential NULL pointer dereference Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 04/29] netfilter: nft_set_rbtree: check for inactive element after flag mismatch Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 05/29] netfilter: bridge: set skb transport_header before entering NF_INET_PRE_ROUTING Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 06/29] sc16is7xx: missing unregister/delete driver on error in sc16is7xx_init() Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 07/29] serial: ar933x_uart: Fix build failure with disabled console Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 08/29] usb: gadget: net2280: Fix overrun of OUT messages Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 09/29] usb: gadget: net2280: Fix net2280_dequeue() Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 10/29] usb: gadget: net2272: Fix net2272_dequeue() Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 11/29] ARM: dts: pfla02: increase phy reset duration Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 12/29] net: ks8851: Dequeue RX packets explicitly Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 13/29] net: ks8851: Reassert reset pin if chip ID check fails Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 14/29] net: ks8851: Delay requesting IRQ until opened Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 15/29] net: ks8851: Set initial carrier state to down Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 16/29] staging: rtl8712: uninitialized memory in read_bbreg_hdl() Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 17/29] NFS: Fix a typo in nfs_init_timeout_values() Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 18/29] net: xilinx: fix possible object reference leak Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 19/29] net: ibm: " Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 20/29] net: ethernet: ti: " Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 21/29] scsi: qla4xxx: fix a potential NULL pointer dereference Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 22/29] usb: u132-hcd: fix resource leak Sasha Levin
2019-04-22 19:48 ` Sasha Levin [this message]
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 24/29] ceph: fix use-after-free on symlink traversal Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 25/29] scsi: zfcp: reduce flood of fcrscn1 trace records on multi-element RSCN Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 26/29] libata: fix using DMA buffers on stack Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 27/29] gpio: of: Fix of_gpiochip_add() error path Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 28/29] kconfig/[mn]conf: handle backspace (^H) key Sasha Levin
2019-04-22 19:48 ` [PATCH AUTOSEL 4.9 29/29] leds: pca9532: fix a potential NULL pointer dereference Sasha Levin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190422194848.13049-23-sashal@kernel.org \
--to=sashal@kernel.org \
--cc=fabien.dessenne@st.com \
--cc=gregkh@linuxfoundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome