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bus/pci: fix leak with multiple bus scan 

The addition of the bus_info field did not account for the fact that the
PCI bus can be scanned multiple times (like for device hotplug and other
uses in SPDK).
Indeed, during pci_scan_one() for devices that were already registered,
the pci_common_set() overwrites the bus_info field, leaking the
previously allocated memory.

Since the bus_info content is fixed for a PCI device, we can simply skip
allocation if dev->bus_info is already set.

Fixes: 8f4de2dba9 ("bus/pci: fill bus specific information")

Reported-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Signed-off-by: David Marchand <david.marchand@redhat.com>
This commit is contained in:
David Marchand 2022-11-21 12:05:58 +01:00
parent fac23f030c
commit db4092276a
1 changed files with 3 additions and 2 deletions
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5
drivers/bus/pci/pci_common.c
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@ -114,8 +114,9 @@ pci_common_set(struct rte_pci_device *dev)
/* Otherwise, it uses the internal, canonical form. */
dev->device.name = dev->name;
if (asprintf(&dev->bus_info, "vendor_id=%"PRIx16", device_id=%"PRIx16,
dev->id.vendor_id, dev->id.device_id) != -1)
if (dev->bus_info != NULL ||
asprintf(&dev->bus_info, "vendor_id=%"PRIx16", device_id=%"PRIx16,
dev->id.vendor_id, dev->id.device_id) != -1)
dev->device.bus_info = dev->bus_info;
}