From: Sascha Hauer s.hauer@pengutronix.de
commit aa382ffa705bea9931ec92b6f3c70e1fdb372195 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: b562ec8f74e4 ("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 --- drivers/pci/pci-sysfs.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1167,11 +1167,9 @@ static int pci_create_attr(struct pci_de
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_de 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; + } + + if (write_combine) + pdev->res_attr_wc[num] = res_attr; + else + pdev->res_attr[num] = res_attr;
- return retval; + return 0; }
/**