[Qemu-devel] [PATCH 2/3] scsi, pci, qdev, isa-bus, sysbus: don't let *_get_fw_dev_path return NULL

[jim]

From: Jim Meyering <meyer...@redhat.com>

Use g_strdup rather than strdup, because the sole caller
(qdev_get_fw_dev_path_helper) assumes it gets non-NULL, and dereferences
it.  Besides, in that caller, the allocated buffer is already freed with
g_free, so it's better to allocate with a matching g_strdup.

In one case, (scsi-bus.c) it was trivial, so I replaced an snprintf+
g_strdup combination with an equivalent g_strdup_printf use.

Signed-off-by: Jim Meyering <meyer...@redhat.com>
---
 hw/ide/qdev.c | 2 +-
 hw/isa-bus.c  | 2 +-
 hw/pci.c      | 2 +-
 hw/qdev.c     | 2 +-
 hw/scsi-bus.c | 8 ++------
 hw/sysbus.c   | 2 +-
 6 files changed, 7 insertions(+), 11 deletions(-)

diff --git a/hw/ide/qdev.c b/hw/ide/qdev.c
index a46578d..9edfd8b 100644
--- a/hw/ide/qdev.c
+++ b/hw/ide/qdev.c
@@ -50,7 +50,7 @@ static char *idebus_get_fw_dev_path(DeviceState *dev)
     snprintf(path, sizeof(path), "%s@%d", qdev_fw_name(dev),
              ((IDEBus*)dev->parent_bus)->bus_id);

-    return strdup(path);
+    return g_strdup(path);
 }

 static int ide_qdev_init(DeviceState *qdev)
diff --git a/hw/isa-bus.c b/hw/isa-bus.c
index 5a43f03..822b040 100644
--- a/hw/isa-bus.c
+++ b/hw/isa-bus.c
@@ -227,7 +227,7 @@ static char *isabus_get_fw_dev_path(DeviceState *dev)
         snprintf(path + off, sizeof(path) - off, "@%04x", d->ioport_id);
     }

-    return strdup(path);
+    return g_strdup(path);
 }

 MemoryRegion *isa_address_space(ISADevice *dev)
diff --git a/hw/pci.c b/hw/pci.c
index b706e69..dc21631 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -1898,7 +1898,7 @@ static char *pcibus_get_fw_dev_path(DeviceState *dev)
                    PCI_SLOT(d->devfn));
     if (PCI_FUNC(d->devfn))
         snprintf(path + off, sizeof(path) + off, ",%x", PCI_FUNC(d->devfn));
-    return strdup(path);
+    return g_strdup(path);
 }

 static char *pcibus_get_dev_path(DeviceState *dev)
diff --git a/hw/qdev.c b/hw/qdev.c
index 6a8f6bd..ab299cf 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -512,7 +512,7 @@ char* qdev_get_fw_dev_path(DeviceState *dev)

     path[l-1] = '\0';

-    return strdup(path);
+    return g_strdup(path);
 }

 static char *qdev_get_type(Object *obj, Error **errp)
diff --git a/hw/scsi-bus.c b/hw/scsi-bus.c
index 8ab9bcd..a4e93d1 100644
--- a/hw/scsi-bus.c
+++ b/hw/scsi-bus.c
@@ -1470,12 +1470,8 @@ static char *scsibus_get_dev_path(DeviceState *dev)
 static char *scsibus_get_fw_dev_path(DeviceState *dev)
 {
     SCSIDevice *d = SCSI_DEVICE(dev);
-    char path[100];
-
-    snprintf(path, sizeof(path), "channel@%x/%s@%x,%x", d->channel,
-             qdev_fw_name(dev), d->id, d->lun);
-
-    return strdup(path);
+    return g_strdup_printf("channel@%x/%s@%x,%x", d->channel,
+                           qdev_fw_name(dev), d->id, d->lun);
 }

 SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int id, int lun)
diff --git a/hw/sysbus.c b/hw/sysbus.c
index db4efcc..8a9b85d 100644
--- a/hw/sysbus.c
+++ b/hw/sysbus.c
@@ -203,7 +203,7 @@ static char *sysbus_get_fw_dev_path(DeviceState *dev)
         snprintf(path + off, sizeof(path) - off, "@i%04x", s->pio[0]);
     }

-    return strdup(path);
+    return g_strdup(path);
 }

 void sysbus_add_memory(SysBusDevice *dev, target_phys_addr_t addr,
-- 
1.7.10.2.484.gcd07cc5