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Message-Id: <20190214213547.41783-1-jannh@google.com> Date: Thu, 14 Feb 2019 22:35:47 +0100 From: Jann Horn <jannh@...gle.com> To: "David S. Miller" <davem@...emloft.net>, Dmitry Tarnyagin <dmitry.tarnyagin@...kless.no>, jannh@...gle.com Cc: netdev@...r.kernel.org Subject: [PATCH net-next] net: caif: use skb helpers instead of open-coding them Use existing skb_put_data() and skb_trim() instead of open-coding them, with the skb_put_data() first so that logically, `skb` still contains the data to be copied in its data..tail area when skb_put_data() reads it. This change on its own is a cleanup, and it is also necessary for potential future integration of skbuffs with things like KASAN. Signed-off-by: Jann Horn <jannh@...gle.com> --- net/caif/cfpkt_skbuff.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/net/caif/cfpkt_skbuff.c b/net/caif/cfpkt_skbuff.c index 38c2b7a890dd..37ac5ca0ffdf 100644 --- a/net/caif/cfpkt_skbuff.c +++ b/net/caif/cfpkt_skbuff.c @@ -319,16 +319,12 @@ struct cfpkt *cfpkt_append(struct cfpkt *dstpkt, if (tmppkt == NULL) return NULL; tmp = pkt_to_skb(tmppkt); - skb_set_tail_pointer(tmp, dstlen); - tmp->len = dstlen; - memcpy(tmp->data, dst->data, dstlen); + skb_put_data(tmp, dst->data, dstlen); cfpkt_destroy(dstpkt); dst = tmp; } - memcpy(skb_tail_pointer(dst), add->data, skb_headlen(add)); + skb_put_data(dst, add->data, skb_headlen(add)); cfpkt_destroy(addpkt); - dst->tail += addlen; - dst->len += addlen; return skb_to_pkt(dst); } @@ -359,13 +355,11 @@ struct cfpkt *cfpkt_split(struct cfpkt *pkt, u16 pos) if (skb2 == NULL) return NULL; + skb_put_data(skb2, split, len2nd); + /* Reduce the length of the original packet */ - skb_set_tail_pointer(skb, pos); - skb->len = pos; + skb_trim(skb, pos); - memcpy(skb2->data, split, len2nd); - skb2->tail += len2nd; - skb2->len += len2nd; skb2->priority = skb->priority; return skb_to_pkt(skb2); } -- 2.21.0.rc0.258.g878e2cd30e-goog
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