[PATCH] drivers core: Free dma_range_map when driver probe failed

[Meng . Li]

From: Limeng <meng...@windriver.com>

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: sta...@vger.kernel.org
Signed-off-by: Meng Li <meng...@windriver.com>
---
 drivers/base/dd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 148e81969e04..8e4871aa34bc 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -612,6 +612,7 @@ 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);
        if (dev->bus)
                blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
                                             BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
-- 
2.17.1