From: Limeng <[email protected]>
There will be memory leak if driver probe failed. Trace as below:
backtrace:
[<000000002415258f>] kmemleak_alloc+0x3c/0x50
[<00000000f447ebe4>] __kmalloc+0x208/0x530
[<0000000048bc7b3a>] of_dma_get_range+0xe4/0x1b0
[<0000000041e39065>] of_dma_configure_id+0x58/0x27c
[<000000006356866a>] platform_dma_configure+0x2c/0x40
......
[<000000000afcf9b5>] ret_from_fork+0x10/0x3c
This issue is introduced by commit e0d072782c73("dma-mapping:
introduce DMA range map, supplanting dma_pfn_offset "). It doesn't
free dma_range_map when driver probe failed and cause above
memory leak. So, add code to free it in error path.
v2:
set dev->dma_range_map as NULL after memory free.
Fixes: e0d072782c73("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset ")
Cc: [email protected]
Signed-off-by: Meng Li <[email protected]>
---
drivers/base/dd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 148e81969e04..3c94ebc8d4bb 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -612,6 +612,8 @@ static int really_probe(struct device *dev, struct device_driver *drv)
else if (drv->remove)
drv->remove(dev);
probe_failed:
+ kfree(dev->dma_range_map);
+ dev->dma_range_map = NULL;
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
--
2.17.1
On Tue, Jan 05, 2021 at 01:41:48PM +0800, [email protected] wrote:
> From: Limeng <[email protected]>
This does not match your signed-off-by line :(
> -----Original Message-----
> From: Greg KH <[email protected]>
> Sent: Tuesday, January 5, 2021 2:01 PM
> To: Li, Meng <[email protected]>
> Cc: [email protected]; [email protected];
> [email protected]; Hao, Kexin <[email protected]>
> Subject: Re: [PATCH v2] drivers core: Free dma_range_map when driver
> probe failed
>
> On Tue, Jan 05, 2021 at 01:41:48PM +0800, [email protected] wrote:
> > From: Limeng <[email protected]>
>
> This does not match your signed-off-by line :(
I will fix it.
Thanks,
Limeng