| Message ID | 20211209120456.696879-1-sudeep.holla@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] firmware: arm_scpi: Fix string overflow in SCPI genpd driver | expand |
From: Arnd Bergmann <arnd@arndb.de> On Thu, 9 Dec 2021 12:04:56 +0000, Sudeep Holla wrote: > 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. Applied to for-next, thanks! [1/1] firmware: arm_scpi: Fix string overflow in SCPI genpd driver commit: c29ec614f0da82db6edd1fece28ebba5ae656155 Arnd
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;
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/ -- 2.25.1