tree d69c8ed51d926b9bc79b2e7a6c078be3d79cb55f
parent 98571b5aa776d4a69eadd7d4e5c9d4e69365ab9a
author Alex Elder <elder@inktank.com> 1357844218 -0600
committer Alex Elder <elder@inktank.com> 1359156794 -0600

rbd: check for overflow in rbd_get_num_segments()

The return type of rbd_get_num_segments() is int, but the values it
operates on are u64.  Although it's not likely, there's no guarantee
the result won't exceed what can be respresented in an int.  The
function is already designed to return -ERANGE on error, so just add
this possible overflow as another reason to return that.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>