On 27/04/2021 13:11, Andy Shevchenko wrote: > On Tue, Apr 27, 2021 at 2:49 PM Colin King <colin.king@xxxxxxxxxxxxx> wrote: >> >> From: Colin Ian King <colin.king@xxxxxxxxxxxxx> >> >> The error return of config->id dereferences the kfree'd object config. >> Fix this by using a temporary variable for the id to avoid this issue. > > Thanks! > I'm wondering how I missed this... Nevertheless > > Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> > >> Addresses-Coverity: ("Read from pointer aftyer free") > > after > Can that be fixed before applying rather me sending a V3? >> Fixes: a49d14276ac4 ("gpio: sim: allocate IDA numbers earlier") >> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx> >> --- >> V2: Don't make id local to the if statement to improve coding style. >> Thanks to Bartosz Golaszewski for this improvement suggestion. >> --- >> drivers/gpio/gpio-sim.c | 8 +++++--- >> 1 file changed, 5 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/gpio/gpio-sim.c b/drivers/gpio/gpio-sim.c >> index 2e2e6399e453..b21541c0b700 100644 >> --- a/drivers/gpio/gpio-sim.c >> +++ b/drivers/gpio/gpio-sim.c >> @@ -744,20 +744,22 @@ static struct config_item * >> gpio_sim_config_make_item(struct config_group *group, const char *name) >> { >> struct gpio_sim_chip_config *config; >> + int id; >> >> config = kzalloc(sizeof(*config), GFP_KERNEL); >> if (!config) >> return ERR_PTR(-ENOMEM); >> >> - config->id = ida_alloc(&gpio_sim_ida, GFP_KERNEL); >> - if (config->id < 0) { >> + id = ida_alloc(&gpio_sim_ida, GFP_KERNEL); >> + if (id < 0) { >> kfree(config); >> - return ERR_PTR(config->id); >> + return ERR_PTR(id); >> } >> >> config_item_init_type_name(&config->item, name, >> &gpio_sim_chip_config_type); >> config->num_lines = 1; >> + config->id = id; >> mutex_init(&config->lock); >> >> return &config->item; >> -- >> 2.30.2 >> > >