Commit d6db3f5c authored by Michael S. Tsirkin's avatar Michael S. Tsirkin

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.
Reviewed-by: default avatarJuan Quintela <>
Signed-off-by: default avatarMichael S. Tsirkin <>
parent 73a99f08
......@@ -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);
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