From: sashiko-bot@kernel.org
To: "Michael Reeves" <michael.reeves077@gmail.com>
Cc: linux-usb@vger.kernel.org
Subject: Re: [PATCH] usb: typec: tipd: assign partner identity to persistent memory
Date: Sat, 07 Nov 2026 10:13:14 +0000 [thread overview]
Message-ID: <sashiko-outbox-202812@kernel.org> (raw)
In-Reply-To: <20261107-tipd-stack-uaf-fix-v1-1-efcb517924ec@gmail.com>
> From: Michael Reeves <michael.reeves077@gmail.com>
>
> cd321x_update_work() passes a pointer to a local stack variable
> (&st.partner_identity) to typec_register_partner(). The Type-C core
> caches this pointer, leading to a stack-use-after-free and a kernel
> Oops when accessed later (e.g., via get_pd_product_type()).
>
> Fix this by copying the identity to the heap-allocated cd321x struct
> and passing a pointer to that persistent memory instead. Move up
> the assignment to cd321x->cur_partner_identity, so this works.
>
> Reported-by: Nicole Mazzuca <nicole@streganil.no>
> Closes: https://github.com/AsahiLinux/linux/issues/668
> Fixes: 82432bbfb9e8 ("usb: typec: tipd: Handle mode transitions for CD321x")
> Cc: stable@vger.kernel.org
> Signed-off-by: Michael Reeves <michael.reeves077@gmail.com>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261107-tipd-stack-uaf-fix-v1-1-efcb517924ec@gmail.com?part=1
next prev parent reply other threads:[~2026-11-07 10:13 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-07 10:06 [PATCH] usb: typec: tipd: assign partner identity to persistent memory Michael Reeves via B4 Relay
2026-11-07 10:06 ` Michael Reeves
2026-11-07 10:13 ` sashiko-bot [this message]
2026-11-07 20:12 ` Sven Peter
2026-11-11 14:27 ` Heikki Krogerus
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