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Date: Tue, 10 Aug 2021 19:30:27 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Filip Schauer <filip@....at> Subject: [PATCH 5.13 119/175] drivers core: Fix oops when driver probe fails From: Filip Schauer <filip@....at> 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@...r.kernel.org> Signed-off-by: Filip Schauer <filip@....at> Link: https://lore.kernel.org/r/20210727112311.GA7645@DESKTOP-E8BN1B0.localdomain Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/base/dd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -634,8 +634,6 @@ 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); @@ -643,6 +641,8 @@ 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);
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