This is a note to let you know that I've just added the patch titled
usb: ucsi: Fix NULL pointer deref in ucsi_connector_change()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-ucsi-fix-null-pointer-deref-in-ucsi_connector_change.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f87fb985452ab2083967103ac00bfd68fb182764 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Wed, 8 Mar 2023 16:42:42 +0100
Subject: usb: ucsi: Fix NULL pointer deref in ucsi_connector_change()
From: Hans de Goede <hdegoede@xxxxxxxxxx>
commit f87fb985452ab2083967103ac00bfd68fb182764 upstream.
When ucsi_init() fails, ucsi->connector is NULL, yet in case of
ucsi_acpi we may still get events which cause the ucs_acpi code to call
ucsi_connector_change(), which then derefs the NULL ucsi->connector
pointer.
Fix this by not setting ucsi->ntfy inside ucsi_init() until ucsi_init()
has succeeded, so that ucsi_connector_change() ignores the events
because UCSI_ENABLE_NTFY_CONNECTOR_CHANGE is not set in the ntfy mask.
Fixes: bdc62f2bae8f ("usb: typec: ucsi: Simplified registration and I/O API")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217106
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230308154244.722337-2-hdegoede@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/typec/ucsi/ucsi.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1202,7 +1202,7 @@ out_unlock:
static int ucsi_init(struct ucsi *ucsi)
{
struct ucsi_connector *con;
- u64 command;
+ u64 command, ntfy;
int ret;
int i;
@@ -1214,8 +1214,8 @@ static int ucsi_init(struct ucsi *ucsi)
}
/* Enable basic notifications */
- ucsi->ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
- command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
+ ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
+ command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
ret = ucsi_send_command(ucsi, command, NULL, 0);
if (ret < 0)
goto err_reset;
@@ -1247,12 +1247,13 @@ static int ucsi_init(struct ucsi *ucsi)
}
/* Enable all notifications */
- ucsi->ntfy = UCSI_ENABLE_NTFY_ALL;
- command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
+ ntfy = UCSI_ENABLE_NTFY_ALL;
+ command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
ret = ucsi_send_command(ucsi, command, NULL, 0);
if (ret < 0)
goto err_unregister;
+ ucsi->ntfy = ntfy;
return 0;
err_unregister:
Patches currently in stable-queue which might be from hdegoede@xxxxxxxxxx are
queue-5.15/usb-ucsi-fix-null-pointer-deref-in-ucsi_connector_change.patch
queue-5.15/efi-sysfb_efi-fix-dmi-quirks-not-working-for-simpledrm.patch
