Without the bound checks for scpi_pd->name, it could result in the buffer overflow when copying the SCPI device name from the corresponding device tree node as the name string is set at maximum size of 30.

Let us fix it by using devm_kasprintf so that the string buffer is allocated dynamically.

Cc: stable@vger.kernel.org Fixes: 8bec4337ad40 ("firmware: scpi: add device power domain support using genpd") Reported-by: Pedro Batista pedbap.g@gmail.com Cc: Cristian Marussi cristian.marussi@arm.com Signed-off-by: Sudeep Holla sudeep.holla@arm.com --- drivers/firmware/scpi_pm_domain.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)

Hi ARM SoC team,

Can you apply this directly as I don't have any other fix at the moment.

Regards, Sudeep

v1->v2: - Fixed accidentally dropped '.' in the name - Used devm_kasprintf instead of combination of kasprintf and devm_kstrdup

v1: https://lore.kernel.org/r/20211206153150.565685-1-sudeep.holla@arm.com/

diff --git a/drivers/firmware/scpi_pm_domain.c b/drivers/firmware/scpi_pm_domain.c index 51201600d789..800673910b51 100644 --- a/drivers/firmware/scpi_pm_domain.c +++ b/drivers/firmware/scpi_pm_domain.c @@ -16,7 +16,6 @@ struct scpi_pm_domain { struct generic_pm_domain genpd; struct scpi_ops *ops; u32 domain; - char name[30]; };

/* @@ -110,8 +109,13 @@ static int scpi_pm_domain_probe(struct platform_device *pdev)

scpi_pd->domain = i; scpi_pd->ops = scpi_ops; - sprintf(scpi_pd->name, "%pOFn.%d", np, i); - scpi_pd->genpd.name = scpi_pd->name; + scpi_pd->genpd.name = devm_kasprintf(dev, GFP_KERNEL, + "%pOFn.%d", np, i); + if (!scpi_pd->genpd.name) { + dev_err(dev, "Failed to allocate genpd name:%pOFn.%d\n", + np, i); + continue; + } scpi_pd->genpd.power_off = scpi_pd_power_off; scpi_pd->genpd.power_on = scpi_pd_power_on;

-- 2.25.1