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Date: Tue, 23 Feb 2010 18:57:58 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org, virtualization@...ts.osdl.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>, markmc@...hat.com, gleb@...hat.com, herbert.xu@...hat.com, quintela@...hat.com, dlaor@...hat.com, avi@...hat.com Subject: [PATCH 3/3] vhost: fix get_user_pages_fast error handling 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 <mst@...hat.com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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