From e3db9ef6eb39ac6d969787bc15756778c2c5ca66 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Sun, 21 Oct 2012 11:52:00 +0100 Subject: [PATCH] drivers/iio/industrialio-event.c: eliminate possible double free The function __iio_add_event_config_attrs is only called once, by the function iio_device_register_eventset. If the call fails, iio_device_register_eventset calls __iio_remove_event_config_attrs. There is thus no need for __iio_add_event_config_attrs to also call __iio_remove_event_config_attrs on failure. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // @r@ identifier f,free,a; parameter list[n] ps; type T; expression e; @@ f(ps,T a,...) { ... when any when != a = e if(...) { ... free(a); ... return ...; } ... when any } @@ identifier r.f,r.free; expression x,a; expression list[r.n] xs; @@ * x = f(xs,a,...); if (...) { ... free(a); ... return ...; } // Signed-off-by: Julia Lawall Signed-off-by: Jonathan Cameron --- drivers/iio/industrialio-event.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c index 857e6306c5c..261cae00557 100644 --- a/drivers/iio/industrialio-event.c +++ b/drivers/iio/industrialio-event.c @@ -350,15 +350,10 @@ static inline int __iio_add_event_config_attrs(struct iio_dev *indio_dev) ret = iio_device_add_event_sysfs(indio_dev, &indio_dev->channels[j]); if (ret < 0) - goto error_clear_attrs; + return ret; attrcount += ret; } return attrcount; - -error_clear_attrs: - __iio_remove_event_config_attrs(indio_dev); - - return ret; } static bool iio_check_for_dynamic_events(struct iio_dev *indio_dev)