Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993441AbdDYSsa (ORCPT ); Tue, 25 Apr 2017 14:48:30 -0400 Received: from frisell.zx2c4.com ([192.95.5.64]:60783 "EHLO frisell.zx2c4.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1952299AbdDYSrr (ORCPT ); Tue, 25 Apr 2017 14:47:47 -0400 From: "Jason A. Donenfeld" To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, David.Laight@aculab.com, kernel-hardening@lists.openwall.com, davem@davemloft.net Cc: "Jason A. Donenfeld" Subject: [PATCH v6 2/5] ipsec: check return value of skb_to_sgvec always Date: Tue, 25 Apr 2017 20:47:31 +0200 Message-Id: <20170425184734.26563-2-Jason@zx2c4.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20170425184734.26563-1-Jason@zx2c4.com> References: <20170425155215.4835-1-Jason@zx2c4.com> <20170425184734.26563-1-Jason@zx2c4.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6212 Lines: 192 Signed-off-by: Jason A. Donenfeld --- net/ipv4/ah4.c | 8 ++++++-- net/ipv4/esp4.c | 30 ++++++++++++++++++++---------- net/ipv6/ah6.c | 8 ++++++-- net/ipv6/esp6.c | 31 +++++++++++++++++++++---------- 4 files changed, 53 insertions(+), 24 deletions(-) diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c index 22377c8ff14b..e8f862358518 100644 --- a/net/ipv4/ah4.c +++ b/net/ipv4/ah4.c @@ -220,7 +220,9 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb) ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); sg_init_table(sg, nfrags + sglists); - skb_to_sgvec_nomark(skb, sg, 0, skb->len); + err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); + if (unlikely(err < 0)) + goto out_free; if (x->props.flags & XFRM_STATE_ESN) { /* Attach seqhi sg right after packet payload */ @@ -393,7 +395,9 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb) skb_push(skb, ihl); sg_init_table(sg, nfrags + sglists); - skb_to_sgvec_nomark(skb, sg, 0, skb->len); + err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); + if (unlikely(err < 0)) + goto out_free; if (x->props.flags & XFRM_STATE_ESN) { /* Attach seqhi sg right after packet payload */ diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index b1e24446e297..42cb09cc8533 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -360,9 +360,13 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb) esph = esp_output_set_extra(skb, esph, extra); sg_init_table(sg, nfrags); - skb_to_sgvec(skb, sg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + clen + alen); + err = skb_to_sgvec(skb, sg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + clen + alen); + if (unlikely(err < 0)) { + spin_unlock_bh(&x->lock); + goto error; + } allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); @@ -381,11 +385,13 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb) pfrag->offset = pfrag->offset + allocsize; sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); - skb_to_sgvec(skb, dsg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + clen + alen); + err = skb_to_sgvec(skb, dsg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + clen + alen); spin_unlock_bh(&x->lock); + if (unlikely(err < 0)) + goto error; goto skip_cow2; } @@ -422,9 +428,11 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb) esph = esp_output_set_extra(skb, esph, extra); sg_init_table(sg, nfrags); - skb_to_sgvec(skb, sg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + clen + alen); + err = skb_to_sgvec(skb, sg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + clen + alen); + if (unlikely(err < 0)) + goto error; skip_cow2: if ((x->props.flags & XFRM_STATE_ESN)) @@ -658,7 +666,9 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb) esp_input_set_header(skb, seqhi); sg_init_table(sg, nfrags); - skb_to_sgvec(skb, sg, 0, skb->len); + err = skb_to_sgvec(skb, sg, 0, skb->len); + if (unlikely(err < 0)) + goto out; skb->ip_summed = CHECKSUM_NONE; diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c index dda6035e3b84..755f38271dd5 100644 --- a/net/ipv6/ah6.c +++ b/net/ipv6/ah6.c @@ -423,7 +423,9 @@ static int ah6_output(struct xfrm_state *x, struct sk_buff *skb) ah->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); sg_init_table(sg, nfrags + sglists); - skb_to_sgvec_nomark(skb, sg, 0, skb->len); + err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); + if (unlikely(err < 0)) + goto out_free; if (x->props.flags & XFRM_STATE_ESN) { /* Attach seqhi sg right after packet payload */ @@ -606,7 +608,9 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb) ip6h->hop_limit = 0; sg_init_table(sg, nfrags + sglists); - skb_to_sgvec_nomark(skb, sg, 0, skb->len); + err = skb_to_sgvec_nomark(skb, sg, 0, skb->len); + if (unlikely(err < 0)) + goto out_free; if (x->props.flags & XFRM_STATE_ESN) { /* Attach seqhi sg right after packet payload */ diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index ff54faa75631..017e2c2d36e1 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -339,9 +339,13 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) esph = esp_output_set_esn(skb, esph, seqhi); sg_init_table(sg, nfrags); - skb_to_sgvec(skb, sg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + clen + alen); + err = skb_to_sgvec(skb, sg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + clen + alen); + if (unlikely(err < 0)) { + spin_unlock_bh(&x->lock); + goto error; + } allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES); @@ -360,12 +364,15 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) pfrag->offset = pfrag->offset + allocsize; sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); - skb_to_sgvec(skb, dsg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + clen + alen); + err = skb_to_sgvec(skb, dsg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + clen + alen); spin_unlock_bh(&x->lock); + if (unlikely(err < 0)) + goto error; + goto skip_cow2; } } @@ -403,9 +410,11 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb) esph = esp_output_set_esn(skb, esph, seqhi); sg_init_table(sg, nfrags); - skb_to_sgvec(skb, sg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + clen + alen); + err = skb_to_sgvec(skb, sg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + clen + alen); + if (unlikely(err < 0)) + goto error; skip_cow2: if ((x->props.flags & XFRM_STATE_ESN)) @@ -600,7 +609,9 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb) esp_input_set_header(skb, seqhi); sg_init_table(sg, nfrags); - skb_to_sgvec(skb, sg, 0, skb->len); + ret = skb_to_sgvec(skb, sg, 0, skb->len); + if (unlikely(ret < 0)) + goto out; skb->ip_summed = CHECKSUM_NONE; -- 2.12.2