diff options
| author | Hans de Goede <hansg@kernel.org> | 2025-09-13 14:35:15 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-25 12:00:08 +0300 |
| commit | 689aee35ce671aab752f159e5c8e66d7685e6887 (patch) | |
| tree | 3ebcf1a6ec0a2dec17d240ecf84adcd7e9492063 /net/rfkill | |
| parent | 7e4c3cd7f0a113edbef8c253b5f7460cd26a121f (diff) | |
| download | linux-689aee35ce671aab752f159e5c8e66d7685e6887.tar.xz | |
net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer
commit b6f56a44e4c1014b08859dcf04ed246500e310e5 upstream.
Since commit 7d5e9737efda ("net: rfkill: gpio: get the name and type from
device property") rfkill_find_type() gets called with the possibly
uninitialized "const char *type_name;" local variable.
On x86 systems when rfkill-gpio binds to a "BCM4752" or "LNV4752"
acpi_device, the rfkill->type is set based on the ACPI acpi_device_id:
rfkill->type = (unsigned)id->driver_data;
and there is no "type" property so device_property_read_string() will fail
and leave type_name uninitialized, leading to a potential crash.
rfkill_find_type() does accept a NULL pointer, fix the potential crash
by initializing type_name to NULL.
Note likely sofar this has not been caught because:
1. Not many x86 machines actually have a "BCM4752"/"LNV4752" acpi_device
2. The stack happened to contain NULL where type_name is stored
Fixes: 7d5e9737efda ("net: rfkill: gpio: get the name and type from device property")
Cc: stable@vger.kernel.org
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20250913113515.21698-1-hansg@kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/rfkill')
| -rw-r--r-- | net/rfkill/rfkill-gpio.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c index b12edbe0ef45..badc71acbbdd 100644 --- a/net/rfkill/rfkill-gpio.c +++ b/net/rfkill/rfkill-gpio.c @@ -79,10 +79,10 @@ static int rfkill_gpio_acpi_probe(struct device *dev, static int rfkill_gpio_probe(struct platform_device *pdev) { struct rfkill_gpio_data *rfkill; - struct gpio_desc *gpio; + const char *type_name = NULL; const char *name_property; const char *type_property; - const char *type_name; + struct gpio_desc *gpio; int ret; rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |