From: zhang jiao <zhangjiao2@xxxxxxxxxxxxxxxxxxxx> The return value of copy_from_iter and copy_to_iter can't be negative, check whether the copied lengths are equal. Signed-off-by: zhang jiao <zhangjiao2@xxxxxxxxxxxxxxxxxxxx> --- 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 9f27c3f6091b..0c8a17cbb22e 100644 --- a/drivers/vhost/vringh.c +++ b/drivers/vhost/vringh.c @@ -1115,6 +1115,7 @@ 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, @@ -1132,9 +1133,9 @@ 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; -- 2.33.0
