usb: typec: tcpm: Defensively bound altmode array accesses

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While svdm_consume_modes() already prevents mode_data.altmodes from
exceeding ALTMODE_DISCOVERY_MAX during SVDM discovery, defensively
bounding array iteration indices against ALTMODE_DISCOVERY_MAX in altmode
registration and unregistration helpers guarantees protection against
out-of-bounds accesses in the event of memory corruption.

Ensure that tcpm_register_plug_altmodes() is also bounded alongside
tcpm_register_partner_altmodes() and tcpm_unregister_altmodes.

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: RD Babiera <rdbabiera@google.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260629225729.2749896-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Badhri Jagan Sridharan 2026-06-29 22:57:29 +00:00 • committed by Greg Kroah-Hartman

parent 14618b21ea

commit 227db98088

1 changed files with 6 additions and 5 deletions

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drivers/usb/typec/tcpm/tcpm.c

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