[PATCH 5.10 142/199] drivers core: Free dma_range_map when driver probe failed

Greg Kroah-Hartman
2021-01-25T19:19:30Z

From: Meng Li <Meng.Li@windriver.com>

commit d0243bbd5dd3ebbd49dafa8b56bb911d971131d0 upstream.

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.

Fixes: e0d072782c73 ("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset ")
Cc: stable@vger.kernel.org
Signed-off-by: Meng Li <Meng.Li@windriver.com>
Link: https://lore.kernel.org/r/20210105070927.14968-1-Meng.Li@windriver.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/base/dd.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -612,6 +612,8 @@ dev_groups_failed:
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);