[Virtio-fs] [PATCH 1/3] tools/virtiofsd/buffer.c: check whether buf is NULL in fuse_bufvec_advance func

[Dr. David Alan Gilbert]

* Haotian Li (lihaotian9 at huawei.com) wrote:
> In fuse_bufvec_advance func, calling fuse_bufvec_current func
> may return NULL, so we should check whether buf is NULL before
> using it.
> 
> Signed-off-by: Haotian Li <lihaotian9 at huawei.com>
> Signed-off-by: Zhiqiang Liu <liuzhiqiang26 at huawei.com>
> ---
>  tools/virtiofsd/buffer.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
> index 27c1377f22..bdc608c221 100644
> --- a/tools/virtiofsd/buffer.c
> +++ b/tools/virtiofsd/buffer.c
> @@ -246,6 +246,10 @@ static int fuse_bufvec_advance(struct fuse_bufvec *bufv, size_t len)
>  {
>      const struct fuse_buf *buf = fuse_bufvec_current(bufv);
> 
> +    if (!buf) {
> +        return 0;
> +    }
> +

Reviewed-by: Dr. David Alan Gilbert <dgilbert at redhat.com>

>      bufv->off += len;
>      assert(bufv->off <= buf->size);
>      if (bufv->off == buf->size) {
> -- 
> 
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-- 
Dr. David Alan Gilbert / dgilbert at redhat.com / Manchester, UK