esp: Fix memleaks on error paths.

We leak the temporary allocated resources in error paths,
fix this by freeing them.

Fixes: fca11ebde3f ("esp4: Reorganize esp_output")
Fixes: 383d0350f2c ("esp6: Reorganize esp_output")
Fixes: 3f29770723f ("ipsec: check return value of skb_to_sgvec always")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 0cbee0a..dbb31a9 100644 (file)
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -381,7 +381,7 @@ int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *
                           (unsigned char *)esph - skb->data,
                           assoclen + ivlen + esp->clen + alen);
        if (unlikely(err < 0))
-               goto error;
+               goto error_free;
 
        if (!esp->inplace) {
                int allocsize;
@@ -392,7 +392,7 @@ int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *
                spin_lock_bh(&x->lock);
                if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
                        spin_unlock_bh(&x->lock);
-                       goto error;
+                       goto error_free;
                }
 
                skb_shinfo(skb)->nr_frags = 1;
@@ -409,7 +409,7 @@ int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *
                                   (unsigned char *)esph - skb->data,
                                   assoclen + ivlen + esp->clen + alen);
                if (unlikely(err < 0))
-                       goto error;
+                       goto error_free;
        }
 
        if ((x->props.flags & XFRM_STATE_ESN))
@@ -442,8 +442,9 @@ int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *
 
        if (sg != dsg)
                esp_ssg_unref(x, tmp);
-       kfree(tmp);
 
+error_free:
+       kfree(tmp);
 error:
        return err;
 }
@@ -695,8 +696,10 @@ skip_cow:
 
        sg_init_table(sg, nfrags);
        err = skb_to_sgvec(skb, sg, 0, skb->len);
-       if (unlikely(err < 0))
+       if (unlikely(err < 0)) {
+               kfree(tmp);
                goto out;
+       }
 
        skb->ip_summed = CHECKSUM_NONE;
 

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 9ed3547..392def1 100644 (file)
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -345,7 +345,7 @@ int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
                           (unsigned char *)esph - skb->data,
                           assoclen + ivlen + esp->clen + alen);
        if (unlikely(err < 0))
-               goto error;
+               goto error_free;
 
        if (!esp->inplace) {
                int allocsize;
@@ -356,7 +356,7 @@ int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
                spin_lock_bh(&x->lock);
                if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
                        spin_unlock_bh(&x->lock);
-                       goto error;
+                       goto error_free;
                }
 
                skb_shinfo(skb)->nr_frags = 1;
@@ -373,7 +373,7 @@ int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
                                   (unsigned char *)esph - skb->data,
                                   assoclen + ivlen + esp->clen + alen);
                if (unlikely(err < 0))
-                       goto error;
+                       goto error_free;
        }
 
        if ((x->props.flags & XFRM_STATE_ESN))
@@ -406,8 +406,9 @@ int esp6_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info
 
        if (sg != dsg)
                esp_ssg_unref(x, tmp);
-       kfree(tmp);
 
+error_free:
+       kfree(tmp);
 error:
        return err;
 }