vfio/pci: Handle subsystem realpath() returning NULL
Fix error reported by Coverity where realpath can return NULL,
resulting in a segfault in strcmp(). This should never happen given
that we're working through regularly structured sysfs paths, but
trivial enough to easily avoid.
Fixes: 238e917285
("vfio/ccw/pci: Allow devices to opt-in for ballooning")
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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@ -2879,7 +2879,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
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tmp = g_strdup_printf("%s/subsystem", vdev->vbasedev.sysfsdev);
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subsys = realpath(tmp, NULL);
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g_free(tmp);
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is_mdev = (strcmp(subsys, "/sys/bus/mdev") == 0);
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is_mdev = subsys && (strcmp(subsys, "/sys/bus/mdev") == 0);
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free(subsys);
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trace_vfio_mdev(vdev->vbasedev.name, is_mdev);
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