From: Sudeep Holla sudeep.holla@arm.com

stable inclusion from stable-v4.19.222 commit 7e8645ca2c0046f7cd2f0f7d569fc036c8abaedb category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6SID CVE: CVE-2021-47609

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

--------------------------------

commit 865ed67ab955428b9aa771d8b4f1e4fb7fd08945 upstream.

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.

Fixes: 8bec4337ad40 ("firmware: scpi: add device power domain support using genpd") Reported-by: Pedro Batista pedbap.g@gmail.com Signed-off-by: Sudeep Holla sudeep.holla@arm.com Cc: stable@vger.kernel.org Cc: Cristian Marussi cristian.marussi@arm.com Link: https://lore.kernel.org/r/20211209120456.696879-1-sudeep.holla@arm.com' Signed-off-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yi Yang yiyang13@huawei.com --- drivers/firmware/scpi_pm_domain.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/firmware/scpi_pm_domain.c b/drivers/firmware/scpi_pm_domain.c index f395dec27113..a6e62a793fbe 100644 --- a/drivers/firmware/scpi_pm_domain.c +++ b/drivers/firmware/scpi_pm_domain.c @@ -27,7 +27,6 @@ struct scpi_pm_domain { struct generic_pm_domain genpd; struct scpi_ops *ops; u32 domain; - char name[30]; };

/* @@ -121,8 +120,13 @@ static int scpi_pm_domain_probe(struct platform_device *pdev)

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