6.6-stable review patch. If anyone has any objections, please let me know.
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From: zhang jiao zhangjiao2@cmss.chinamobile.com
[ Upstream commit 82a8d0fda55b35361ee7f35b54fa2b66d7847d2b ]
The return value of copy_from_iter and copy_to_iter can't be negative, check whether the copied lengths are equal.
Fixes: 309bba39c945 ("vringh: iterate on iotlb_translate to handle large translations") Cc: "Stefano Garzarella" sgarzare@redhat.com Signed-off-by: zhang jiao zhangjiao2@cmss.chinamobile.com Message-Id: 20250910091739.2999-1-zhangjiao2@cmss.chinamobile.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/vhost/vringh.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c index 60961c65fd472..134cc10af776b 100644 --- a/drivers/vhost/vringh.c +++ b/drivers/vhost/vringh.c @@ -1191,6 +1191,7 @@ static inline int copy_from_iotlb(const struct vringh *vrh, void *dst, struct iov_iter iter; u64 translated; int ret; + size_t size;
ret = iotlb_translate(vrh, (u64)(uintptr_t)src, len - total_translated, &translated, @@ -1208,9 +1209,9 @@ static inline int copy_from_iotlb(const struct vringh *vrh, void *dst, translated); }
- ret = copy_from_iter(dst, translated, &iter); - if (ret < 0) - return ret; + size = copy_from_iter(dst, translated, &iter); + if (size != translated) + return -EFAULT;
src += translated; dst += translated;