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util: Resolve Coverity FORWARD_NULL

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Convert virPCIDriverFile to return the buffer allocated (or not) and make the
appropriate check in the caller.

Signed-off-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
John Ferlan 2015-06-30 15:49:05 -04:00
parent d7ddb4c2f0
commit e3939e86ba
1 changed files with 15 additions and 12 deletions
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27
src/util/virpci.c
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@ -215,14 +215,13 @@ virPCIDriverDir(char **buffer, const char *driver)
}
static int
virPCIDriverFile(char **buffer, const char *driver, const char *file)
static char *
virPCIDriverFile(const char *driver, const char *file)
{
VIR_FREE(*buffer);
char *buffer;
if (virAsprintf(buffer, PCI_SYSFS "drivers/%s/%s", driver, file) < 0)
return -1;
return 0;
ignore_value(virAsprintf(&buffer, PCI_SYSFS "drivers/%s/%s", driver, file));
return buffer;
}
@ -1126,7 +1125,7 @@ virPCIDeviceUnbindFromStub(virPCIDevicePtr dev)
goto reprobe;
/* Xen's pciback.ko wants you to use remove_slot on the specific device */
if (virPCIDriverFile(&path, driver, "remove_slot") < 0)
if (!(path = virPCIDriverFile(driver, "remove_slot")))
goto cleanup;
if (virFileExists(path) && virFileWriteStr(path, dev->name, 0) < 0) {
@ -1148,7 +1147,8 @@ virPCIDeviceUnbindFromStub(virPCIDevicePtr dev)
* available, then re-probing would just cause the device to be
* re-bound to the stub.
*/
if (driver && virPCIDriverFile(&path, driver, "remove_id") < 0)
VIR_FREE(path);
if (driver && !(path = virPCIDriverFile(driver, "remove_id")))
goto cleanup;
if (!driver || !virFileExists(drvdir) || virFileExists(path)) {
@ -1212,7 +1212,7 @@ virPCIDeviceBindToStub(virPCIDevicePtr dev,
* is triggered for such a device, it will also be immediately
* bound by the stub.
*/
if (virPCIDriverFile(&path, stubDriverName, "new_id") < 0)
if (!(path = virPCIDriverFile(stubDriverName, "new_id")))
goto cleanup;
if (virFileWriteStr(path, dev->id, 0) < 0) {
@ -1239,7 +1239,8 @@ virPCIDeviceBindToStub(virPCIDevicePtr dev,
*/
if (!virFileLinkPointsTo(driverLink, stubDriverPath)) {
/* Xen's pciback.ko wants you to use new_slot first */
if (virPCIDriverFile(&path, stubDriverName, "new_slot") < 0)
VIR_FREE(path);
if (!(path = virPCIDriverFile(stubDriverName, "new_slot")))
goto remove_id;
if (virFileExists(path) && virFileWriteStr(path, dev->name, 0) < 0) {
@ -1251,7 +1252,8 @@ virPCIDeviceBindToStub(virPCIDevicePtr dev,
}
dev->remove_slot = true;
if (virPCIDriverFile(&path, stubDriverName, "bind") < 0)
VIR_FREE(path);
if (!(path = virPCIDriverFile(stubDriverName, "bind")))
goto remove_id;
if (virFileWriteStr(path, dev->name, 0) < 0) {
@ -1271,7 +1273,8 @@ virPCIDeviceBindToStub(virPCIDevicePtr dev,
/* If 'remove_id' exists, remove the device id from pci-stub's dynamic
* ID table so that 'drivers_probe' works below.
*/
if (virPCIDriverFile(&path, stubDriverName, "remove_id") < 0) {
VIR_FREE(path);
if (!(path = virPCIDriverFile(stubDriverName, "remove_id"))) {
/* We do not remove PCI ID from pci-stub, and we cannot reprobe it */
if (dev->reprobe) {
VIR_WARN("Could not remove PCI ID '%s' from %s, and the device "