Btrfs: fix btrfs_ioctl_dev_info() crash on missing device
When a filesystem is mounted with the degraded option, it is possible that some of the devices are not there. btrfs_ioctl_dev_info() crashs in this case because the device name is a NULL pointer. This ioctl was only used for scrub. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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@ -2262,7 +2262,10 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
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di_args->bytes_used = dev->bytes_used;
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di_args->total_bytes = dev->total_bytes;
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memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
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strncpy(di_args->path, dev->name, sizeof(di_args->path));
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if (dev->name)
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strncpy(di_args->path, dev->name, sizeof(di_args->path));
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else
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di_args->path[0] = '\0';
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out:
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if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
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