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Message-Id: <20221207093924.v2.1.I1864b6a7ee98824118b93677868d22d3750f439b@changeid>
Date: Wed, 7 Dec 2022 09:39:40 +0000
From: Victor Ding <victording@...omium.org>
To: linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev
Cc: pmalani@...omium.org, groeck@...omium.org, dustin@...ett.net,
gustavoars@...nel.org, gregkh@...uxfoundation.org,
sebastian.reichel@...labora.com, dnojiri@...omium.org,
lee.jones@...aro.org, bleung@...omium.org,
tinghan.shen@...iatek.com, tzungbi@...nel.org,
Victor Ding <victording@...omium.org>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: [PATCH v2] platform/chrome: cros_ec_typec: zero out stale pointers
`cros_typec_get_switch_handles` allocates four pointers when obtaining
type-c switch handles. These pointers are all freed if failing to obtain
any of them; therefore, pointers in `port` become stale. The stale
pointers eventually cause use-after-free or double free in later code
paths. Zeroing out all pointer fields after freeing to eliminate these
stale pointers.
Fixes: f28adb41dab4 ("platform/chrome: cros_ec_typec: Register Type C switches")
Fixes: 1a8912caba02 ("platform/chrome: cros_ec_typec: Get retimer handle")
Signed-off-by: Victor Ding <victording@...omium.org>
---
Changes in v2:
- Updated commit messages;
- No code changes.
drivers/platform/chrome/cros_ec_typec.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 2a7ff14dc37e..59de4ce01fab 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -173,10 +173,13 @@ static int cros_typec_get_switch_handles(struct cros_typec_port *port,
role_sw_err:
typec_switch_put(port->ori_sw);
+ port->ori_sw = NULL;
ori_sw_err:
typec_retimer_put(port->retimer);
+ port->retimer = NULL;
retimer_sw_err:
typec_mux_put(port->mux);
+ port->mux = NULL;
mux_err:
return -ENODEV;
}
--
2.39.0.rc0.267.gcb52ba06e7-goog
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