[PATCH v5 05/14] irqchip/davinci-cp-intc: Fix potential resource leaks

From: Tiezhu Yang
Date: Sun Jul 05 2020 - 21:19:48 EST


In the function davinci_cp_intc_do_init(), system resources
"config->reg.start", "davinci_cp_intc_base" and "irq_base"
were not released in a few error cases. Thus add jump targets
for the completion of the desired exception handling.

Fixes: 0fc3d74cf946 ("irqchip: davinci-cp-intc: move the driver to drivers/irqchip")
Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
---
drivers/irqchip/irq-davinci-cp-intc.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/irqchip/irq-davinci-cp-intc.c b/drivers/irqchip/irq-davinci-cp-intc.c
index 276da277..2c2e115 100644
--- a/drivers/irqchip/irq-davinci-cp-intc.c
+++ b/drivers/irqchip/irq-davinci-cp-intc.c
@@ -162,6 +162,7 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
unsigned int num_regs = BITS_TO_LONGS(config->num_irqs);
int offset, irq_base;
void __iomem *req;
+ int ret;

req = request_mem_region(config->reg.start,
resource_size(&config->reg),
@@ -175,7 +176,8 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
resource_size(&config->reg));
if (!davinci_cp_intc_base) {
pr_err("%s: unable to ioremap register range\n", __func__);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_release;
}

davinci_cp_intc_write(0, DAVINCI_CP_INTC_GLOBAL_ENABLE);
@@ -210,7 +212,8 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
if (irq_base < 0) {
pr_err("%s: unable to allocate interrupt descriptors: %d\n",
__func__, irq_base);
- return irq_base;
+ ret = irq_base;
+ goto err_iounmap;
}

davinci_cp_intc_irq_domain = irq_domain_add_legacy(
@@ -219,7 +222,8 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,

if (!davinci_cp_intc_irq_domain) {
pr_err("%s: unable to create an interrupt domain\n", __func__);
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_free_descs;
}

set_handle_irq(davinci_cp_intc_handle_irq);
@@ -228,6 +232,14 @@ davinci_cp_intc_do_init(const struct davinci_cp_intc_config *config,
davinci_cp_intc_write(1, DAVINCI_CP_INTC_GLOBAL_ENABLE);

return 0;
+
+err_free_descs:
+ irq_free_descs(irq_base, config->num_irqs);
+err_iounmap:
+ iounmap(davinci_cp_intc_base);
+err_release:
+ release_mem_region(config->reg.start, resource_size(&config->reg));
+ return ret;
}

int __init davinci_cp_intc_init(const struct davinci_cp_intc_config *config)
--
2.1.0