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platform/chrome: cros_ec_typec: zero out stale pointers

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`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: f28adb41da ("platform/chrome: cros_ec_typec: Register Type C switches")
Fixes: 1a8912caba ("platform/chrome: cros_ec_typec: Get retimer handle")
Signed-off-by: Victor Ding <victording@chromium.org>
Acked-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20221207093924.v2.1.I1864b6a7ee98824118b93677868d22d3750f439b@changeid
This commit is contained in:
Victor Ding
2022-12-07 09:39:40 +00:00
committed by Tzung-Bi Shih
parent 5a2d966236
commit 9a8aadcf0b
1 changed files with 3 additions and 0 deletions
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3
drivers/platform/chrome/cros_ec_typec.c
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@@ -173,10 +173,13 @@ static int cros_typec_get_switch_handles(struct cros_typec_port *port,
role_sw_err: role_sw_err:
typec_switch_put(port->ori_sw); typec_switch_put(port->ori_sw);
port->ori_sw = NULL;
ori_sw_err: ori_sw_err:
typec_retimer_put(port->retimer); typec_retimer_put(port->retimer);
port->retimer = NULL;
retimer_sw_err: retimer_sw_err:
typec_mux_put(port->mux); typec_mux_put(port->mux);
port->mux = NULL;
mux_err: mux_err:
return -ENODEV; return -ENODEV;
} }