diff options
| author | Xie Yongji <[email protected]> | 2022-05-05 18:09:10 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <[email protected]> | 2022-06-08 08:56:03 -0400 |
| commit | dbd29e0752286af74243cf891accf472b2f3edd8 (patch) | |
| tree | b1469cec62f38eee776e02b7cf6fa9d1b0a87168 | |
| parent | f38b3c6a788f75da151b46c7da61ff26649e1843 (diff) | |
vringh: Fix loop descriptors check in the indirect cases
We should use size of descriptor chain to test loop condition
in the indirect case. And another statistical count is also introduced
for indirect descriptors to avoid conflict with the statistical count
of direct descriptors.
Fixes: f87d0fbb5798 ("vringh: host-side implementation of virtio rings.")
Signed-off-by: Xie Yongji <[email protected]>
Signed-off-by: Fam Zheng <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Acked-by: Jason Wang <[email protected]>
| -rw-r--r-- | drivers/vhost/vringh.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c index 14e2043d7685..eab55accf381 100644 --- a/drivers/vhost/vringh.c +++ b/drivers/vhost/vringh.c @@ -292,7 +292,7 @@ __vringh_iov(struct vringh *vrh, u16 i, int (*copy)(const struct vringh *vrh, void *dst, const void *src, size_t len)) { - int err, count = 0, up_next, desc_max; + int err, count = 0, indirect_count = 0, up_next, desc_max; struct vring_desc desc, *descs; struct vringh_range range = { -1ULL, 0 }, slowrange; bool slow = false; @@ -349,7 +349,12 @@ __vringh_iov(struct vringh *vrh, u16 i, continue; } - if (count++ == vrh->vring.num) { + if (up_next == -1) + count++; + else + indirect_count++; + + if (count > vrh->vring.num || indirect_count > desc_max) { vringh_bad("Descriptor loop in %p", descs); err = -ELOOP; goto fail; @@ -411,6 +416,7 @@ __vringh_iov(struct vringh *vrh, u16 i, i = return_from_indirect(vrh, &up_next, &descs, &desc_max); slow = false; + indirect_count = 0; } else break; } |