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btrfs: read entire device info under lock 

There's a theoretical possibility of reading stale (or even more
theoretically, freed) data from DEV_INFO ioctl when the device would
disappear between an early mutex unlock and data being copied from the
device structure.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
hifive-unleashed-5.1
David Sterba 2013-04-26 15:20:23 +00:00 committed by Josef Bacik
parent f7a52a40ca
commit 55793c0d03
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/ioctl.c
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@ -2432,7 +2432,6 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
mutex_lock(&fs_devices->device_list_mutex);
dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL);
mutex_unlock(&fs_devices->device_list_mutex);
if (!dev) {
ret = -ENODEV;
@ -2456,6 +2455,7 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
}
out:
mutex_unlock(&fs_devices->device_list_mutex);
if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
ret = -EFAULT;