From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 8 Mar 2023 16:42:42 +0100
Subject: [PATCH] usb: ucsi: Fix NULL pointer deref in ucsi_connector_change()
References: bsc#1012628
Patch-mainline: 6.2.9
Git-commit: f87fb985452ab2083967103ac00bfd68fb182764
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@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230308154244.722337-2-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/usb/typec/ucsi/ucsi.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 1cf8947c..8cbbb002 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1205,7 +1205,7 @@ static int ucsi_register_port(struct ucsi *ucsi, int index)
static int ucsi_init(struct ucsi *ucsi)
{
struct ucsi_connector *con;
- u64 command;
+ u64 command, ntfy;
int ret;
int i;
@@ -1217,8 +1217,8 @@ 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;
@@ -1250,12 +1250,13 @@ 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:
--
2.35.3