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hwrng: amd - Fix PCI device refcount leak

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[ Upstream commit ecadb5b0111ea19fc7c240bb25d424a94471eb7d ]

for_each_pci_dev() is implemented by pci_get_device(). The comment of
pci_get_device() says that it will increase the reference count for the
returned pci_dev and also decrease the reference count for the input
pci_dev @from if it is not NULL.

If we break for_each_pci_dev() loop with pdev not NULL, we need to call
pci_dev_put() to decrease the reference count. Add the missing
pci_dev_put() for the normal and error path.

Fixes: 96d63c0297 ("[PATCH] Add AMD HW RNG driver")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xiongfeng Wang
2022-12-02 21:22:33 +08:00
committed by Greg Kroah-Hartman
parent 38da26c855
commit 5998e5c30e
1 changed files with 13 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/char/hw_random/amd-rng.c
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@@ -143,15 +143,19 @@ static int __init mod_init(void)
found:
err = pci_read_config_dword(pdev, 0x58, &pmbase);
if (err)
return err;
goto put_dev;
pmbase &= 0x0000FF00;
if (pmbase == 0)
return -EIO;
if (pmbase == 0) {
err = -EIO;
goto put_dev;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
if (!priv) {
err = -ENOMEM;
goto put_dev;
}
if (!request_region(pmbase + PMBASE_OFFSET, PMBASE_SIZE, DRV_NAME)) {
dev_err(&pdev->dev, DRV_NAME " region 0x%x already in use!\n",
@@ -185,6 +189,8 @@ err_iomap:
release_region(pmbase + PMBASE_OFFSET, PMBASE_SIZE);
out:
kfree(priv);
put_dev:
pci_dev_put(pdev);
return err;
}
@@ -200,6 +206,8 @@ static void __exit mod_exit(void)
release_region(priv->pmbase + PMBASE_OFFSET, PMBASE_SIZE);
pci_dev_put(priv->pcidev);
kfree(priv);
}