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drivers core: Fix oops when driver probe fails

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commit 4d1014c1816c0395eca5d1d480f196a4c63119d0 upstream.

dma_range_map is freed to early, which might cause an oops when
a driver probe fails.
 Call trace:
  is_free_buddy_page+0xe4/0x1d4
  __free_pages+0x2c/0x88
  dma_free_contiguous+0x64/0x80
  dma_direct_free+0x38/0xb4
  dma_free_attrs+0x88/0xa0
  dmam_release+0x28/0x34
  release_nodes+0x78/0x8c
  devres_release_all+0xa8/0x110
  really_probe+0x118/0x2d0
  __driver_probe_device+0xc8/0xe0
  driver_probe_device+0x54/0xec
  __driver_attach+0xe0/0xf0
  bus_for_each_dev+0x7c/0xc8
  driver_attach+0x30/0x3c
  bus_add_driver+0x17c/0x1c4
  driver_register+0xc0/0xf8
  __platform_driver_register+0x34/0x40
  ...

This issue is introduced by commit d0243bbd5dd3 ("drivers core:
Free dma_range_map when driver probe failed"). It frees
dma_range_map before the call to devres_release_all, which is too
early. The solution is to free dma_range_map only after
devres_release_all.

Fixes: d0243bbd5dd3 ("drivers core: Free dma_range_map when driver probe failed")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Filip Schauer <filip@mg6.at>
Link: https://lore.kernel.org/r/20210727112311.GA7645@DESKTOP-E8BN1B0.localdomain
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Filip Schauer
2021-07-27 13:23:11 +02:00
committed by Greg Kroah-Hartman
parent faec2c68ea
commit 551e0c5d6b
1 changed files with 2 additions and 2 deletions
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4
drivers/base/dd.c
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@@ -617,8 +617,6 @@ 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);
@@ -626,6 +624,8 @@ pinctrl_bind_failed:
device_links_no_driver(dev);
devres_release_all(dev);
arch_teardown_dma_ops(dev);
kfree(dev->dma_range_map);
dev->dma_range_map = NULL;
driver_sysfs_remove(dev);
dev->driver = NULL;
dev_set_drvdata(dev, NULL);