From 3f29770723fe498a5c5f57c3a31a996ebdde03e1 Mon Sep 17 00:00:00 2001 From: "Jason A. Donenfeld" Date: Sun, 4 Jun 2017 04:16:23 +0200 Subject: ipsec: check return value of skb_to_sgvec always Signed-off-by: Jason A. Donenfeld Cc: Steffen Klassert Cc: Herbert Xu Cc: "David S. Miller" Signed-off-by: David S. Miller --- net/ipv4/ah4.c | 8 ++++++-- net/ipv4/esp4.c | 20 +++++++++++++------- 2 files changed, 19 insertions(+), 9 deletions(-) (limited to 'net/ipv4') 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 93322f895eab..d815d1755473 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -377,9 +377,11 @@ int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info * esp->esph = esph; sg_init_table(sg, esp->nfrags); - skb_to_sgvec(skb, sg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + esp->clen + alen); + err = skb_to_sgvec(skb, sg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + esp->clen + alen); + if (unlikely(err < 0)) + goto error; if (!esp->inplace) { int allocsize; @@ -403,9 +405,11 @@ int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info * spin_unlock_bh(&x->lock); sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1); - skb_to_sgvec(skb, dsg, - (unsigned char *)esph - skb->data, - assoclen + ivlen + esp->clen + alen); + err = skb_to_sgvec(skb, dsg, + (unsigned char *)esph - skb->data, + assoclen + ivlen + esp->clen + alen); + if (unlikely(err < 0)) + goto error; } if ((x->props.flags & XFRM_STATE_ESN)) @@ -690,7 +694,9 @@ skip_cow: 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; -- cgit v1.2.3-59-g8ed1b