6.15-stable review patch. If anyone has any objections, please let me know.
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From: Zhe Qiao qiaozhe@iscas.ac.cn
commit 2b8be57fa0c88ac824a906f29c04d728f9f6047a upstream.
This reverts commit 631b2af2f357 ("PCI/ACPI: Fix allocated memory release on error in pci_acpi_scan_root()").
The reverted patch causes the 'ri->cfg' and 'root_ops' resources to be released multiple times.
When acpi_pci_root_create() fails, these resources have already been released internally by the __acpi_pci_root_release_info() function.
Releasing them again in pci_acpi_scan_root() leads to incorrect behavior and potential memory issues.
We plan to resolve the issue using a more appropriate fix.
Reported-by: Dan Carpenter dan.carpenter@linaro.org Closes: https://lore.kernel.org/all/aEmdnuw715btq7Q5@stanley.mountain/ Signed-off-by: Zhe Qiao qiaozhe@iscas.ac.cn Acked-by: Dan Carpenter dan.carpenter@linaro.org Link: https://patch.msgid.link/20250619072608.2075475-1-qiaozhe@iscas.ac.cn Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/pci-acpi.c | 23 ++++++++++------------- 1 file changed, 10 insertions(+), 13 deletions(-)
--- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -1676,19 +1676,24 @@ struct pci_bus *pci_acpi_scan_root(struc return NULL;
root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL); - if (!root_ops) - goto free_ri; + if (!root_ops) { + kfree(ri); + return NULL; + }
ri->cfg = pci_acpi_setup_ecam_mapping(root); - if (!ri->cfg) - goto free_root_ops; + if (!ri->cfg) { + kfree(ri); + kfree(root_ops); + return NULL; + }
root_ops->release_info = pci_acpi_generic_release_info; root_ops->prepare_resources = pci_acpi_root_prepare_resources; root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops; bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg); if (!bus) - goto free_cfg; + return NULL;
/* If we must preserve the resource configuration, claim now */ host = pci_find_host_bridge(bus); @@ -1705,14 +1710,6 @@ struct pci_bus *pci_acpi_scan_root(struc pcie_bus_configure_settings(child);
return bus; - -free_cfg: - pci_ecam_free(ri->cfg); -free_root_ops: - kfree(root_ops); -free_ri: - kfree(ri); - return NULL; }
void pcibios_add_bus(struct pci_bus *bus)