On 17/10/14 12:16, Juergen Gross wrote: > When a new p2m leaf is allocated this leaf is linked into the p2m tree > via cmpxchg. Unfortunately the compare value for checking the success > of the update is read after checking for the need of a new leaf. It is > possible that a new leaf has been linked into the tree concurrently > in between. This could lead to a leaked memory page and to the loss of > some p2m entries. > > Avoid the race by using the read compare value for checking the need > of a new p2m leaf and use ACCESS_ONCE() to get it. > > There are other places which seem to need ACCESS_ONCE() to ensure > proper operation. Change them accordingly.
Applied, thanks. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
