diff options
| -rw-r--r-- | net/core/skbuff.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 84151cf40aeb..65a74e13c45b 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4946,16 +4946,20 @@ EXPORT_SYMBOL(pskb_extract); */ void skb_condense(struct sk_buff *skb) { - if (!skb->data_len || - skb->data_len > skb->end - skb->tail || - skb_cloned(skb)) - return; - - /* Nice, we can free page frag(s) right now */ - __pskb_pull_tail(skb, skb->data_len); + if (skb->data_len) { + if (skb->data_len > skb->end - skb->tail || + skb_cloned(skb)) + return; - /* Now adjust skb->truesize, since __pskb_pull_tail() does - * not do this. + /* Nice, we can free page frag(s) right now */ + __pskb_pull_tail(skb, skb->data_len); + } + /* At this point, skb->truesize might be over estimated, + * because skb had a fragment, and fragments do not tell + * their truesize. + * When we pulled its content into skb->head, fragment + * was freed, but __pskb_pull_tail() could not possibly + * adjust skb->truesize, not knowing the frag truesize. */ skb->truesize = SKB_TRUESIZE(skb_end_offset(skb)); } |