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| author | Michael S. Tsirkin <mst@redhat.com> | 2017-08-21 22:33:33 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2017-11-14 23:57:39 +0200 |
| commit | ca2c5b33a285723f517fa296b76f7fd36c383dad (patch) | |
| tree | a7b6258591856491ab4abd912c93b02958e81670 /drivers/vhost | |
| parent | 816e85edff0f31bc8e4614eaaf9a0364406d7a8f (diff) | |
| download | linux-stable-ca2c5b33a285723f517fa296b76f7fd36c383dad.tar.gz linux-stable-ca2c5b33a285723f517fa296b76f7fd36c383dad.tar.bz2 linux-stable-ca2c5b33a285723f517fa296b76f7fd36c383dad.zip | |
vhost: fix end of range for access_ok
During access_ok checks, addr increases as we iterate over the data
structure, thus addr + len - 1 will point beyond the end of region we
are translating. Harmless since we then verify that the region covers
addr, but let's not waste cpu cycles.
Reported-by: Koichiro Den <den@klaipeden.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Koichiro Den <den@klaipeden.com>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vhost.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index d6dbb28245e6..33ac2b186b85 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1175,7 +1175,7 @@ static int iotlb_access_ok(struct vhost_virtqueue *vq, { const struct vhost_umem_node *node; struct vhost_umem *umem = vq->iotlb; - u64 s = 0, size, orig_addr = addr; + u64 s = 0, size, orig_addr = addr, last = addr + len - 1; if (vhost_vq_meta_fetch(vq, addr, len, type)) return true; @@ -1183,7 +1183,7 @@ static int iotlb_access_ok(struct vhost_virtqueue *vq, while (len > s) { node = vhost_umem_interval_tree_iter_first(&umem->umem_tree, addr, - addr + len - 1); + last); if (node == NULL || node->start > addr) { vhost_iotlb_miss(vq, addr, access); return false; |