Off-by-one errors happen because nr_snk_pdo and nr_src_pdo are
incorrectly added one. The index of the loop is equal to the number of
PDOs to be updated when leaving the loop and it doesn't need to be added
one.
When doing the power negotiation, TCPM relies on the "nr_snk_pdo" as
the size of the local sink PDO array to match the Source capabilities
of the partner port. If the off-by-one overflow occurs, a wrong RDO
might be sent and unexpected power transfer might happen such as over
voltage or over current (than expected).
"nr_src_pdo" is used to set the Rp level when the port is in Source
role. It is also the array size of the local Source capabilities when
filling up the buffer which will be sent as the Source PDOs (such as
in Power Negotiation). If the off-by-one overflow occurs, a wrong Rp
level might be set and wrong Source PDOs will be sent to the partner
port. This could potentially cause over current or port resets.
Fixes: cd099cde4ed2 ("usb: typec: tcpm: Support multiple capabilities")
Cc: [email protected]
Signed-off-by: Kyle Tso <[email protected]>
---
v1 -> v2:
- update the commit message (adding the problems this patch solves)
drivers/usb/typec/tcpm/tcpm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index ae2b6c94482d..2464710ea0c8 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -6855,14 +6855,14 @@ static int tcpm_pd_set(struct typec_port *p, struct usb_power_delivery *pd)
if (data->sink_desc.pdo[0]) {
for (i = 0; i < PDO_MAX_OBJECTS && data->sink_desc.pdo[i]; i++)
port->snk_pdo[i] = data->sink_desc.pdo[i];
- port->nr_snk_pdo = i + 1;
+ port->nr_snk_pdo = i;
port->operating_snk_mw = data->operating_snk_mw;
}
if (data->source_desc.pdo[0]) {
for (i = 0; i < PDO_MAX_OBJECTS && data->source_desc.pdo[i]; i++)
port->snk_pdo[i] = data->source_desc.pdo[i];
- port->nr_src_pdo = i + 1;
+ port->nr_src_pdo = i;
}
switch (port->state) {
--
2.44.0.396.g6e790dbe36-goog
On Tue, Mar 26, 2024 at 11:19:09PM +0800, Kyle Tso wrote:
> Off-by-one errors happen because nr_snk_pdo and nr_src_pdo are
> incorrectly added one. The index of the loop is equal to the number of
> PDOs to be updated when leaving the loop and it doesn't need to be added
> one.
>
> When doing the power negotiation, TCPM relies on the "nr_snk_pdo" as
> the size of the local sink PDO array to match the Source capabilities
> of the partner port. If the off-by-one overflow occurs, a wrong RDO
> might be sent and unexpected power transfer might happen such as over
> voltage or over current (than expected).
>
> "nr_src_pdo" is used to set the Rp level when the port is in Source
> role. It is also the array size of the local Source capabilities when
> filling up the buffer which will be sent as the Source PDOs (such as
> in Power Negotiation). If the off-by-one overflow occurs, a wrong Rp
> level might be set and wrong Source PDOs will be sent to the partner
> port. This could potentially cause over current or port resets.
>
> Fixes: cd099cde4ed2 ("usb: typec: tcpm: Support multiple capabilities")
> Cc: [email protected]
> Signed-off-by: Kyle Tso <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
> ---
> v1 -> v2:
> - update the commit message (adding the problems this patch solves)
>
> drivers/usb/typec/tcpm/tcpm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index ae2b6c94482d..2464710ea0c8 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -6855,14 +6855,14 @@ static int tcpm_pd_set(struct typec_port *p, struct usb_power_delivery *pd)
> if (data->sink_desc.pdo[0]) {
> for (i = 0; i < PDO_MAX_OBJECTS && data->sink_desc.pdo[i]; i++)
> port->snk_pdo[i] = data->sink_desc.pdo[i];
> - port->nr_snk_pdo = i + 1;
> + port->nr_snk_pdo = i;
> port->operating_snk_mw = data->operating_snk_mw;
> }
>
> if (data->source_desc.pdo[0]) {
> for (i = 0; i < PDO_MAX_OBJECTS && data->source_desc.pdo[i]; i++)
> port->snk_pdo[i] = data->source_desc.pdo[i];
> - port->nr_src_pdo = i + 1;
> + port->nr_src_pdo = i;
> }
>
> switch (port->state) {
> --
> 2.44.0.396.g6e790dbe36-goog
--
heikki
On Tue, Mar 26, 2024 at 11:19:09PM +0800, Kyle Tso wrote:
> Off-by-one errors happen because nr_snk_pdo and nr_src_pdo are
> incorrectly added one. The index of the loop is equal to the number of
> PDOs to be updated when leaving the loop and it doesn't need to be added
> one.
>
> When doing the power negotiation, TCPM relies on the "nr_snk_pdo" as
> the size of the local sink PDO array to match the Source capabilities
> of the partner port. If the off-by-one overflow occurs, a wrong RDO
> might be sent and unexpected power transfer might happen such as over
> voltage or over current (than expected).
>
> "nr_src_pdo" is used to set the Rp level when the port is in Source
> role. It is also the array size of the local Source capabilities when
> filling up the buffer which will be sent as the Source PDOs (such as
> in Power Negotiation). If the off-by-one overflow occurs, a wrong Rp
> level might be set and wrong Source PDOs will be sent to the partner
> port. This could potentially cause over current or port resets.
>
> Fixes: cd099cde4ed2 ("usb: typec: tcpm: Support multiple capabilities")
> Cc: [email protected]
> Signed-off-by: Kyle Tso <[email protected]>
> ---
> v1 -> v2:
> - update the commit message (adding the problems this patch solves)
>
> drivers/usb/typec/tcpm/tcpm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
This fails to apply to my usb-linus branch :(
Can you rebase and resend?
thanks,
greg k-h
On Thu, Apr 4, 2024 at 9:22 PM Greg KH <[email protected]> wrote:
>
> On Tue, Mar 26, 2024 at 11:19:09PM +0800, Kyle Tso wrote:
> > Off-by-one errors happen because nr_snk_pdo and nr_src_pdo are
> > incorrectly added one. The index of the loop is equal to the number of
> > PDOs to be updated when leaving the loop and it doesn't need to be added
> > one.
> >
> > When doing the power negotiation, TCPM relies on the "nr_snk_pdo" as
> > the size of the local sink PDO array to match the Source capabilities
> > of the partner port. If the off-by-one overflow occurs, a wrong RDO
> > might be sent and unexpected power transfer might happen such as over
> > voltage or over current (than expected).
> >
> > "nr_src_pdo" is used to set the Rp level when the port is in Source
> > role. It is also the array size of the local Source capabilities when
> > filling up the buffer which will be sent as the Source PDOs (such as
> > in Power Negotiation). If the off-by-one overflow occurs, a wrong Rp
> > level might be set and wrong Source PDOs will be sent to the partner
> > port. This could potentially cause over current or port resets.
> >
> > Fixes: cd099cde4ed2 ("usb: typec: tcpm: Support multiple capabilities")
> > Cc: [email protected]
> > Signed-off-by: Kyle Tso <[email protected]>
> > ---
> > v1 -> v2:
> > - update the commit message (adding the problems this patch solves)
> >
> > drivers/usb/typec/tcpm/tcpm.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
>
> This fails to apply to my usb-linus branch :(
>
> Can you rebase and resend?
>
> thanks,
>
> greg k-h
Just sent v3