* FAILED: patch "[PATCH] net: hso: fix null-ptr-deref during tty device unregistration" failed to apply to 4.14-stable tree
@ 2021-04-10 14:01 gregkh
2021-04-23 19:07 ` Sudip Mukherjee
0 siblings, 1 reply; 3+ messages in thread
From: gregkh @ 2021-04-10 14:01 UTC (permalink / raw)
To: mail, davem, gregkh; +Cc: stable
The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8a12f8836145ffe37e9c8733dce18c22fb668b66 Mon Sep 17 00:00:00 2001
From: Anirudh Rayabharam <mail@anirudhrb.com>
Date: Wed, 7 Apr 2021 22:57:22 +0530
Subject: [PATCH] net: hso: fix null-ptr-deref during tty device unregistration
Multiple ttys try to claim the same the minor number causing a double
unregistration of the same device. The first unregistration succeeds
but the next one results in a null-ptr-deref.
The get_free_serial_index() function returns an available minor number
but doesn't assign it immediately. The assignment is done by the caller
later. But before this assignment, calls to get_free_serial_index()
would return the same minor number.
Fix this by modifying get_free_serial_index to assign the minor number
immediately after one is found to be and rename it to obtain_minor()
to better reflect what it does. Similary, rename set_serial_by_index()
to release_minor() and modify it to free up the minor number of the
given hso_serial. Every obtain_minor() should have corresponding
release_minor() call.
Fixes: 72dc1c096c705 ("HSO: add option hso driver")
Reported-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com
Tested-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 31d51346786a..9bc58e64b5b7 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -611,7 +611,7 @@ static struct hso_serial *get_serial_by_index(unsigned index)
return serial;
}
-static int get_free_serial_index(void)
+static int obtain_minor(struct hso_serial *serial)
{
int index;
unsigned long flags;
@@ -619,8 +619,10 @@ static int get_free_serial_index(void)
spin_lock_irqsave(&serial_table_lock, flags);
for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
if (serial_table[index] == NULL) {
+ serial_table[index] = serial->parent;
+ serial->minor = index;
spin_unlock_irqrestore(&serial_table_lock, flags);
- return index;
+ return 0;
}
}
spin_unlock_irqrestore(&serial_table_lock, flags);
@@ -629,15 +631,12 @@ static int get_free_serial_index(void)
return -1;
}
-static void set_serial_by_index(unsigned index, struct hso_serial *serial)
+static void release_minor(struct hso_serial *serial)
{
unsigned long flags;
spin_lock_irqsave(&serial_table_lock, flags);
- if (serial)
- serial_table[index] = serial->parent;
- else
- serial_table[index] = NULL;
+ serial_table[serial->minor] = NULL;
spin_unlock_irqrestore(&serial_table_lock, flags);
}
@@ -2230,6 +2229,7 @@ static int hso_stop_serial_device(struct hso_device *hso_dev)
static void hso_serial_tty_unregister(struct hso_serial *serial)
{
tty_unregister_device(tty_drv, serial->minor);
+ release_minor(serial);
}
static void hso_serial_common_free(struct hso_serial *serial)
@@ -2253,24 +2253,22 @@ static void hso_serial_common_free(struct hso_serial *serial)
static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
int rx_size, int tx_size)
{
- int minor;
int i;
tty_port_init(&serial->port);
- minor = get_free_serial_index();
- if (minor < 0)
+ if (obtain_minor(serial))
goto exit2;
/* register our minor number */
serial->parent->dev = tty_port_register_device_attr(&serial->port,
- tty_drv, minor, &serial->parent->interface->dev,
+ tty_drv, serial->minor, &serial->parent->interface->dev,
serial->parent, hso_serial_dev_groups);
- if (IS_ERR(serial->parent->dev))
+ if (IS_ERR(serial->parent->dev)) {
+ release_minor(serial);
goto exit2;
+ }
- /* fill in specific data for later use */
- serial->minor = minor;
serial->magic = HSO_SERIAL_MAGIC;
spin_lock_init(&serial->serial_lock);
serial->num_rx_urbs = num_urbs;
@@ -2667,9 +2665,6 @@ static struct hso_device *hso_create_bulk_serial_device(
serial->write_data = hso_std_serial_write_data;
- /* and record this serial */
- set_serial_by_index(serial->minor, serial);
-
/* setup the proc dirs and files if needed */
hso_log_port(hso_dev);
@@ -2726,9 +2721,6 @@ struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
serial->shared_int->ref_count++;
mutex_unlock(&serial->shared_int->shared_int_lock);
- /* and record this serial */
- set_serial_by_index(serial->minor, serial);
-
/* setup the proc dirs and files if needed */
hso_log_port(hso_dev);
@@ -3113,7 +3105,6 @@ static void hso_free_interface(struct usb_interface *interface)
cancel_work_sync(&serial_table[i]->async_get_intf);
hso_serial_tty_unregister(serial);
kref_put(&serial_table[i]->ref, hso_serial_ref_free);
- set_serial_by_index(i, NULL);
}
}
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: FAILED: patch "[PATCH] net: hso: fix null-ptr-deref during tty device unregistration" failed to apply to 4.14-stable tree
2021-04-10 14:01 FAILED: patch "[PATCH] net: hso: fix null-ptr-deref during tty device unregistration" failed to apply to 4.14-stable tree gregkh
@ 2021-04-23 19:07 ` Sudip Mukherjee
2021-04-24 14:46 ` Greg KH
0 siblings, 1 reply; 3+ messages in thread
From: Sudip Mukherjee @ 2021-04-23 19:07 UTC (permalink / raw)
To: gregkh; +Cc: mail, davem, stable
[-- Attachment #1: Type: text/plain, Size: 415 bytes --]
Hi Greg,
On Sat, Apr 10, 2021 at 04:01:43PM +0200, gregkh@linuxfoundation.org wrote:
>
> The patch below does not apply to the 4.14-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@vger.kernel.org>.
Here is the backport. Will also apply for 4.9-stable and 4.4-stable.
--
Regards
Sudip
[-- Attachment #2: 0001-net-hso-fix-null-ptr-deref-during-tty-device-unregis.patch --]
[-- Type: text/x-diff, Size: 5066 bytes --]
From 69dd8d3a3061aa50deec6aa17f9c8da618dd6c21 Mon Sep 17 00:00:00 2001
From: Anirudh Rayabharam <mail@anirudhrb.com>
Date: Wed, 7 Apr 2021 22:57:22 +0530
Subject: [PATCH] net: hso: fix null-ptr-deref during tty device unregistration
commit 8a12f8836145ffe37e9c8733dce18c22fb668b66 upstream
Multiple ttys try to claim the same the minor number causing a double
unregistration of the same device. The first unregistration succeeds
but the next one results in a null-ptr-deref.
The get_free_serial_index() function returns an available minor number
but doesn't assign it immediately. The assignment is done by the caller
later. But before this assignment, calls to get_free_serial_index()
would return the same minor number.
Fix this by modifying get_free_serial_index to assign the minor number
immediately after one is found to be and rename it to obtain_minor()
to better reflect what it does. Similary, rename set_serial_by_index()
to release_minor() and modify it to free up the minor number of the
given hso_serial. Every obtain_minor() should have corresponding
release_minor() call.
Fixes: 72dc1c096c705 ("HSO: add option hso driver")
Reported-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com
Tested-by: syzbot+c49fe6089f295a05e6f8@syzkaller.appspotmail.com
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Anirudh Rayabharam <mail@anirudhrb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
drivers/net/usb/hso.c | 33 ++++++++++++---------------------
1 file changed, 12 insertions(+), 21 deletions(-)
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 0e3d13e192e3..16f81fafde2a 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -626,7 +626,7 @@ static struct hso_serial *get_serial_by_index(unsigned index)
return serial;
}
-static int get_free_serial_index(void)
+static int obtain_minor(struct hso_serial *serial)
{
int index;
unsigned long flags;
@@ -634,8 +634,10 @@ static int get_free_serial_index(void)
spin_lock_irqsave(&serial_table_lock, flags);
for (index = 0; index < HSO_SERIAL_TTY_MINORS; index++) {
if (serial_table[index] == NULL) {
+ serial_table[index] = serial->parent;
+ serial->minor = index;
spin_unlock_irqrestore(&serial_table_lock, flags);
- return index;
+ return 0;
}
}
spin_unlock_irqrestore(&serial_table_lock, flags);
@@ -644,15 +646,12 @@ static int get_free_serial_index(void)
return -1;
}
-static void set_serial_by_index(unsigned index, struct hso_serial *serial)
+static void release_minor(struct hso_serial *serial)
{
unsigned long flags;
spin_lock_irqsave(&serial_table_lock, flags);
- if (serial)
- serial_table[index] = serial->parent;
- else
- serial_table[index] = NULL;
+ serial_table[serial->minor] = NULL;
spin_unlock_irqrestore(&serial_table_lock, flags);
}
@@ -2241,6 +2240,7 @@ static int hso_stop_serial_device(struct hso_device *hso_dev)
static void hso_serial_tty_unregister(struct hso_serial *serial)
{
tty_unregister_device(tty_drv, serial->minor);
+ release_minor(serial);
}
static void hso_serial_common_free(struct hso_serial *serial)
@@ -2265,25 +2265,23 @@ static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
int rx_size, int tx_size)
{
struct device *dev;
- int minor;
int i;
tty_port_init(&serial->port);
- minor = get_free_serial_index();
- if (minor < 0)
+ if (obtain_minor(serial))
goto exit2;
/* register our minor number */
serial->parent->dev = tty_port_register_device_attr(&serial->port,
- tty_drv, minor, &serial->parent->interface->dev,
+ tty_drv, serial->minor, &serial->parent->interface->dev,
serial->parent, hso_serial_dev_groups);
- if (IS_ERR(serial->parent->dev))
+ if (IS_ERR(serial->parent->dev)) {
+ release_minor(serial);
goto exit2;
+ }
dev = serial->parent->dev;
- /* fill in specific data for later use */
- serial->minor = minor;
serial->magic = HSO_SERIAL_MAGIC;
spin_lock_init(&serial->serial_lock);
serial->num_rx_urbs = num_urbs;
@@ -2676,9 +2674,6 @@ static struct hso_device *hso_create_bulk_serial_device(
serial->write_data = hso_std_serial_write_data;
- /* and record this serial */
- set_serial_by_index(serial->minor, serial);
-
/* setup the proc dirs and files if needed */
hso_log_port(hso_dev);
@@ -2735,9 +2730,6 @@ struct hso_device *hso_create_mux_serial_device(struct usb_interface *interface,
serial->shared_int->ref_count++;
mutex_unlock(&serial->shared_int->shared_int_lock);
- /* and record this serial */
- set_serial_by_index(serial->minor, serial);
-
/* setup the proc dirs and files if needed */
hso_log_port(hso_dev);
@@ -3122,7 +3114,6 @@ static void hso_free_interface(struct usb_interface *interface)
cancel_work_sync(&serial_table[i]->async_get_intf);
hso_serial_tty_unregister(serial);
kref_put(&serial_table[i]->ref, hso_serial_ref_free);
- set_serial_by_index(i, NULL);
}
}
--
2.30.2
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: FAILED: patch "[PATCH] net: hso: fix null-ptr-deref during tty device unregistration" failed to apply to 4.14-stable tree
2021-04-23 19:07 ` Sudip Mukherjee
@ 2021-04-24 14:46 ` Greg KH
0 siblings, 0 replies; 3+ messages in thread
From: Greg KH @ 2021-04-24 14:46 UTC (permalink / raw)
To: Sudip Mukherjee; +Cc: mail, davem, stable
On Fri, Apr 23, 2021 at 08:07:59PM +0100, Sudip Mukherjee wrote:
> Hi Greg,
>
> On Sat, Apr 10, 2021 at 04:01:43PM +0200, gregkh@linuxfoundation.org wrote:
> >
> > The patch below does not apply to the 4.14-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
>
> Here is the backport. Will also apply for 4.9-stable and 4.4-stable.
Thanks, now queued up.
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-04-24 14:46 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-04-10 14:01 FAILED: patch "[PATCH] net: hso: fix null-ptr-deref during tty device unregistration" failed to apply to 4.14-stable tree gregkh
2021-04-23 19:07 ` Sudip Mukherjee
2021-04-24 14:46 ` Greg KH
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).