diff --git a/net/core/filter.c b/net/core/filter.c index d25d52854c21..428df050d021 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -3948,20 +3948,21 @@ void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len) { - struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(xdp); u32 size = xdp->data_end - xdp->data; + struct skb_shared_info *sinfo; void *addr = xdp->data; int i; if (unlikely(offset > 0xffff || len > 0xffff)) return ERR_PTR(-EFAULT); - if (offset + len > xdp_get_buff_len(xdp)) + if (unlikely(offset + len > xdp_get_buff_len(xdp))) return ERR_PTR(-EINVAL); - if (offset < size) /* linear area */ + if (likely(offset < size)) /* linear area */ goto out; + sinfo = xdp_get_shared_info_from_buff(xdp); offset -= size; for (i = 0; i < sinfo->nr_frags; i++) { /* paged area */ u32 frag_size = skb_frag_size(&sinfo->frags[i]);