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authorArnd Bergmann <arnd@arndb.de>2021-07-16 23:00:44 +0200
committerArnd Bergmann <arnd@arndb.de>2021-07-16 23:00:44 +0200
commitd28912d6f0ab6dbd0ca483ae77a4260b145542c5 (patch)
tree0a9d8b80953f441ec36fc2305a8daafed991a703
parent5f291bfd33c8995c69f5a50f21445a4a93584ed2 (diff)
parentdd925db6f07556061c11ab1fbfa4a0145ae6b438 (diff)
Merge tag 'arm-ffa-fixes-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes
Arm FF-A fixes for v5.14 A small set of fixes: - adding check for presence of probe while registering the driver to prevent NULL pointer access - dropping the duplicate check as the driver core already takes care of it - fixing possible ffa_linux_errmap buffer overflow and - fixing kernel-doc warning for comment style * tag 'arm-ffa-fixes-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux: firmware: arm_ffa: Fix a possible ffa_linux_errmap buffer overflow firmware: arm_ffa: Fix the comment style firmware: arm_ffa: Simplify probe function firmware: arm_ffa: Ensure drivers provide a probe function Link: https://lore.kernel.org/r/20210714165806.2617325-1-sudeep.holla@arm.com Signed-off-by: Arnd Bergmann <arnd@arndb.de>
-rw-r--r--drivers/firmware/arm_ffa/bus.c6
-rw-r--r--drivers/firmware/arm_ffa/driver.c8
2 files changed, 8 insertions, 6 deletions
diff --git a/drivers/firmware/arm_ffa/bus.c b/drivers/firmware/arm_ffa/bus.c
index 83166e02b191..00fe595a5bc8 100644
--- a/drivers/firmware/arm_ffa/bus.c
+++ b/drivers/firmware/arm_ffa/bus.c
@@ -46,9 +46,6 @@ static int ffa_device_probe(struct device *dev)
struct ffa_driver *ffa_drv = to_ffa_driver(dev->driver);
struct ffa_device *ffa_dev = to_ffa_dev(dev);
- if (!ffa_device_match(dev, dev->driver))
- return -ENODEV;
-
return ffa_drv->probe(ffa_dev);
}
@@ -99,6 +96,9 @@ int ffa_driver_register(struct ffa_driver *driver, struct module *owner,
{
int ret;
+ if (!driver->probe)
+ return -EINVAL;
+
driver->driver.bus = &ffa_bus_type;
driver->driver.name = driver->name;
driver->driver.owner = owner;
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index b1edb4b2e94a..c9fb56afbcb4 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -120,7 +120,7 @@
#define PACK_TARGET_INFO(s, r) \
(FIELD_PREP(SENDER_ID_MASK, (s)) | FIELD_PREP(RECEIVER_ID_MASK, (r)))
-/**
+/*
* FF-A specification mentions explicitly about '4K pages'. This should
* not be confused with the kernel PAGE_SIZE, which is the translation
* granule kernel is configured and may be one among 4K, 16K and 64K.
@@ -149,8 +149,10 @@ static const int ffa_linux_errmap[] = {
static inline int ffa_to_linux_errno(int errno)
{
- if (errno < FFA_RET_SUCCESS && errno >= -ARRAY_SIZE(ffa_linux_errmap))
- return ffa_linux_errmap[-errno];
+ int err_idx = -errno;
+
+ if (err_idx >= 0 && err_idx < ARRAY_SIZE(ffa_linux_errmap))
+ return ffa_linux_errmap[err_idx];
return -EINVAL;
}