diff options
| author | Sascha Hauer <s.hauer@pengutronix.de> | 2022-11-09 02:05:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-14 12:16:36 +0300 |
| commit | 7c44205748edc229d580a6beaec1efe4a7b38ec1 (patch) | |
| tree | 598a328765190eb571f941a8caaa802fa2976271 /drivers/pci | |
| parent | 99ef6cc791584495987dd11b14769b450dfa5820 (diff) | |
| download | linux-7c44205748edc229d580a6beaec1efe4a7b38ec1.tar.xz | |
PCI/sysfs: Fix double free in error path
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index d15c881e2e7e..361de072dfdc 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1141,11 +1141,9 @@ 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); if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { res_attr->read = pci_read_resource_io; @@ -1161,10 +1159,17 @@ 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 = (void *)(unsigned long)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; } /** |