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Diffstat (limited to 'net/xfrm/xfrm_algo.c')
-rw-r--r--net/xfrm/xfrm_algo.c22
1 files changed, 14 insertions, 8 deletions
diff --git a/net/xfrm/xfrm_algo.c b/net/xfrm/xfrm_algo.c
index be529c4..6249a94 100644
--- a/net/xfrm/xfrm_algo.c
+++ b/net/xfrm/xfrm_algo.c
@@ -532,8 +532,8 @@ EXPORT_SYMBOL_GPL(xfrm_count_enc_supported);
int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
int offset, int len, icv_update_fn_t icv_update)
{
- int end = skb_headlen(skb);
- int i, copy = end - offset;
+ int start = skb_headlen(skb);
+ int i, copy = start - offset;
int err;
struct scatterlist sg;
@@ -556,9 +556,11 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- BUG_TRAP(len >= 0);
+ int end;
- end = offset + skb_shinfo(skb)->frags[i].size;
+ BUG_TRAP(start <= offset + len);
+
+ end = start + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
@@ -566,7 +568,7 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
copy = len;
sg.page = frag->page;
- sg.offset = frag->page_offset;
+ sg.offset = frag->page_offset + offset-start;
sg.length = copy;
err = icv_update(desc, &sg, copy);
@@ -577,19 +579,22 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
return 0;
offset += copy;
}
+ start = end;
}
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *list = skb_shinfo(skb)->frag_list;
for (; list; list = list->next) {
- BUG_TRAP(len >= 0);
+ int end;
+
+ BUG_TRAP(start <= offset + len);
- end = offset + list->len;
+ end = start + list->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
- err = skb_icv_walk(list, desc, 0,
+ err = skb_icv_walk(list, desc, offset-start,
copy, icv_update);
if (unlikely(err))
return err;
@@ -597,6 +602,7 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
return 0;
offset += copy;
}
+ start = end;
}
}
BUG_ON(len);
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