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PCI/sysfs: Fix double free in error path 

commit aa382ffa70 upstream.

When pci_create_attr() fails, pci_remove_resource_files() is called which
will iterate over the res_attr[_wc] arrays and frees every non NULL entry.
To avoid a double free here set the array entry only after it's clear we
successfully initialized it.

Fixes: b562ec8f74 ("PCI: Don't leak memory if sysfs_create_bin_file() fails")
Link: https://lore.kernel.org/r/20221007070735.GX986@pengutronix.de/
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sascha Hauer 2022-11-08 17:05:59 -06:00 committed by Greg Kroah-Hartman
parent 0f4dfff7dc
commit 5e411983bb
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/pci/pci-sysfs.c
View File

@ -1167,11 +1167,9 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
sysfs_bin_attr_init(res_attr);
if (write_combine) {
pdev->res_attr_wc[num] = res_attr;
sprintf(res_attr_name, "resource%d_wc", num);
res_attr->mmap = pci_mmap_resource_wc;
} else {
pdev->res_attr[num] = res_attr;
sprintf(res_attr_name, "resource%d", num);
res_attr->mmap = pci_mmap_resource_uc;
}
@ -1184,10 +1182,17 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
res_attr->size = pci_resource_len(pdev, num);
res_attr->private = &pdev->resource[num];
retval = sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
if (retval)
if (retval) {
kfree(res_attr);
return retval;
}
return retval;
if (write_combine)
pdev->res_attr_wc[num] = res_attr;
else
pdev->res_attr[num] = res_attr;
return 0;
}
/**