Commit 99ba55ad authored by Stefan Behrens's avatar Stefan Behrens Committed by David Sterba

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: default avatarStefan Behrens <sbehrens@giantdisaster.de>
parent b9688bb8
...@@ -2262,7 +2262,10 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) ...@@ -2262,7 +2262,10 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
di_args->bytes_used = dev->bytes_used; di_args->bytes_used = dev->bytes_used;
di_args->total_bytes = dev->total_bytes; di_args->total_bytes = dev->total_bytes;
memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid)); memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
if (dev->name)
strncpy(di_args->path, dev->name, sizeof(di_args->path)); strncpy(di_args->path, dev->name, sizeof(di_args->path));
else
di_args->path[0] = '\0';
out: out:
if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args))) if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
......
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