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media: pci: cx23885: Fix the error handling in cx23885_initdev() 

When the driver fails to call the dma_set_mask(), the driver will get
the following splat:

[   55.853884] BUG: KASAN: use-after-free in __process_removed_driver+0x3c/0x240
[   55.854486] Read of size 8 at addr ffff88810de60408 by task modprobe/590
[   55.856822] Call Trace:
[   55.860327]  __process_removed_driver+0x3c/0x240
[   55.861347]  bus_for_each_dev+0x102/0x160
[   55.861681]  i2c_del_driver+0x2f/0x50

This is because the driver has initialized the i2c related resources
in cx23885_dev_setup() but not released them in error handling, fix this
bug by modifying the error path that jumps after failing to call the
dma_set_mask().

Signed-off-by: Zheyu Ma <zheyuma97@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Zheyu Ma 2022-04-10 08:34:41 +01:00 committed by Mauro Carvalho Chehab
parent f83bd49cbc
commit e8123311cf
1 changed files with 3 additions and 3 deletions
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6
drivers/media/pci/cx23885/cx23885-core.c
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@ -2165,7 +2165,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev,
err = dma_set_mask(&pci_dev->dev, 0xffffffff);
if (err) {
pr_err("%s/0: Oops: no 32bit PCI DMA ???\n", dev->name);
goto fail_ctrl;
goto fail_dma_set_mask;
}
err = request_irq(pci_dev->irq, cx23885_irq,
@ -2173,7 +2173,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev,
if (err < 0) {
pr_err("%s: can't get IRQ %d\n",
dev->name, pci_dev->irq);
goto fail_irq;
goto fail_dma_set_mask;
}
switch (dev->board) {
@ -2195,7 +2195,7 @@ static int cx23885_initdev(struct pci_dev *pci_dev,
return 0;
fail_irq:
fail_dma_set_mask:
cx23885_dev_unregister(dev);
fail_ctrl:
v4l2_ctrl_handler_free(hdl);