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btrfs: fix error pointer dereference in btrfs_ioctl_rm_dev_v2()

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commit d815b3f2f2 upstream.

If memdup_user() fails the error handing will crash when it tries
to kfree() an error pointer.  Just return directly because there is
no cleanup required.

Fixes: 1a15eb724a ("btrfs: use btrfs_get_dev_args_from_path in dev removal ioctls")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter
2021-11-16 14:50:25 +03:00
committed by Greg Kroah-Hartman
parent f88e79727f
commit d35b78cb05
1 changed files with 2 additions and 4 deletions
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fs/btrfs/ioctl.c
+2 -4
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@@ -3231,10 +3231,8 @@ static long btrfs_ioctl_rm_dev_v2(struct file *file, void __user *arg)
return -EPERM;
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args)) {
ret = PTR_ERR(vol_args);
goto out;
}
if (IS_ERR(vol_args))
return PTR_ERR(vol_args);
if (vol_args->flags & ~BTRFS_DEVICE_REMOVE_ARGS_MASK) {
ret = -EOPNOTSUPP;