get_user_pages_fast returns number of pages on success, negative value on failure, but never 0. Fix vhost code to match this logic.
Signed-off-by: Michael S. Tsirkin <[email protected]> --- drivers/vhost/vhost.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index d4f8fdf..d003504 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -646,8 +646,9 @@ static int set_bit_to_user(int nr, void __user *addr) int bit = nr + (log % PAGE_SIZE) * 8; int r; r = get_user_pages_fast(log, 1, 1, &page); - if (r) + if (r < 0) return r; + BUG_ON(r != 1); base = kmap_atomic(page, KM_USER0); set_bit(bit, base); kunmap_atomic(base, KM_USER0); -- 1.7.0.18.g0d53a5 _______________________________________________ Virtualization mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/virtualization
