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| author | RD Babiera <rdbabiera@google.com> | 2025-06-19 01:49:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-10 17:03:05 +0300 |
| commit | 45e9444b3b97eaf51a5024f1fea92f44f39b50c6 (patch) | |
| tree | 6a0376b2692487173f85344cc3708c5aa4b0c23b /include/linux | |
| parent | 24418bc77a66cb5be9f5a837431ba3674ed8b52f (diff) | |
| download | linux-45e9444b3b97eaf51a5024f1fea92f44f39b50c6.tar.xz | |
usb: typec: altmodes/displayport: do not index invalid pin_assignments
commit af4db5a35a4ef7a68046883bfd12468007db38f1 upstream.
A poorly implemented DisplayPort Alt Mode port partner can indicate
that its pin assignment capabilities are greater than the maximum
value, DP_PIN_ASSIGN_F. In this case, calls to pin_assignment_show
will cause a BRK exception due to an out of bounds array access.
Prevent for loop in pin_assignment_show from accessing
invalid values in pin_assignments by adding DP_PIN_ASSIGN_MAX
value in typec_dp.h and using i < DP_PIN_ASSIGN_MAX as a loop
condition.
Fixes: 0e3bb7d6894d ("usb: typec: Add driver for DisplayPort alternate mode")
Cc: stable <stable@kernel.org>
Signed-off-by: RD Babiera <rdbabiera@google.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20250618224943.3263103-2-rdbabiera@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/usb/typec_dp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/usb/typec_dp.h b/include/linux/usb/typec_dp.h index 8d09c2f0a9b8..c3f08af20295 100644 --- a/include/linux/usb/typec_dp.h +++ b/include/linux/usb/typec_dp.h @@ -56,6 +56,7 @@ enum { DP_PIN_ASSIGN_D, DP_PIN_ASSIGN_E, DP_PIN_ASSIGN_F, /* Not supported after v1.0b */ + DP_PIN_ASSIGN_MAX, }; /* DisplayPort alt mode specific commands */ |