bcachefs: bch2_ioctl_disk_resize_journal(): check for integer truncation

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/chardev.c b/fs/bcachefs/chardev.c
index 51d6712..e8b6733 100644 (file)
--- a/fs/bcachefs/chardev.c
+++ b/fs/bcachefs/chardev.c
@@ -627,6 +627,9 @@ static long bch2_ioctl_disk_resize_journal(struct bch_fs *c,
            arg.pad)
                return -EINVAL;
 
+       if (arg.nbuckets > U32_MAX)
+               return -EINVAL;
+
        ca = bch2_device_lookup(c, arg.dev, arg.flags);
        if (IS_ERR(ca))
                return PTR_ERR(ca);