[PATCH 4.14 060/237] clocksource/drivers/bcm2835_timer: Fix memory leak of timer

Greg Kroah-Hartman
2020-02-27T14:39:39Z

From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit 2052d032c06761330bca4944bb7858b00960e868 ]

Currently when setup_irq fails the error exit path will leak the
recently allocated timer structure. Originally the code would
throw a panic but a later commit changed the behaviour to return
via the err_iounmap path and hence we now have a memory leak. Fix
this by adding a err_timer_free error path that kfree's timer.

Addresses-Coverity: ("Resource Leak")
Fixes: 524a7f08983d ("clocksource/drivers/bcm2835_timer: Convert init function to return error")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20191219213246.34437-1-colin.king@canonical.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/clocksource/bcm2835_timer.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c
index 39e489a96ad74..8894cfc32be06 100644
--- a/drivers/clocksource/bcm2835_timer.c
+++ b/drivers/clocksource/bcm2835_timer.c
@@ -134,7 +134,7 @@ static int __init bcm2835_timer_init(struct device_node *node)
ret = setup_irq(irq, &timer->act);
if (ret) {
pr_err("Can't set up timer IRQ\n");
- goto err_iounmap;
+ goto err_timer_free;
}

clockevents_config_and_register(&timer->evt, freq, 0xf, 0xffffffff);
@@ -143,6 +143,9 @@ static int __init bcm2835_timer_init(struct device_node *node)

return 0;

+err_timer_free:
+ kfree(timer);
+
err_iounmap:
iounmap(base);
return ret;
--
2.20.1