On 10/05/2019 10:14, Philipp Zabel wrote:
> Hi Colin,
>
> [added Bartosz to Cc:]
>
> On Thu, 2019-05-09 at 17:00 +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>>
>> Pointer dev is being dereferenced when passed to the inlined
>> functon dev_name, however, dev is later being null checked.
>> Thus there is a potential null pointer dereference on a null
>> dev. Fix this by performing the null check on dev before
>> dereferencing it.
>>
>> Addresses-Coverity: ("Dereference before null check")
>> Fixes: 6691dffab0ab ("reset: add support for non-DT systems")
>> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>> ---
>> drivers/reset/core.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
>> index 81ea77cba123..83f1a1d5ee67 100644
>> --- a/drivers/reset/core.c
>> +++ b/drivers/reset/core.c
>> @@ -691,12 +691,13 @@ __reset_control_get_from_lookup(struct device *dev, const char *con_id,
>> {
>> const struct reset_control_lookup *lookup;
>> struct reset_controller_dev *rcdev;
>> - const char *dev_id = dev_name(dev);
>> + const char *dev_id;
>> struct reset_control *rstc = NULL;
>>
>> if (!dev)
>> return ERR_PTR(-EINVAL);
>
> Thank you for the patch. I think this check should be removed instead,
> though, as __reset_control_get_from_lookup is only ever called from
> __reset_control_get, right after checking dev->of_node. So dev can not
> be NULL here.
Good point, I totally overlooked that. I'll send a V2 shortly.
>
> regards
> Philipp
>
