From: Florian Westphal fw@strlen.de
[ Upstream commit b60a77386b1d4868f72f6353d35dabe5fbe981f2 ]
netfilter did not expect that skb_dst_force() can cause skb to lose its dst entry.
I got a bug report with a skb->dst NULL dereference in netfilter output path. The backtrace contains nf_reinject(), so the dst might have been cleared when skb got queued to userspace.
Other users were fixed via if (skb_dst(skb)) { skb_dst_force(skb); if (!skb_dst(skb)) goto handle_err; }
But I think its preferable to make the 'dst might be cleared' part of the function explicit.
In netfilter case, skb with a null dst is expected when queueing in prerouting hook, so drop skb for the other hooks.
v2: v1 of this patch returned true in case skb had no dst entry. Eric said: Say if we have two skb_dst_force() calls for some reason on the same skb, only the first one will return false.
This now returns false even when skb had no dst, as per Erics suggestion, so callers might need to check skb_dst() first before skb_dst_force().
Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/dst.h | 5 ++++- net/netfilter/nf_queue.c | 6 +++++- 2 files changed, 9 insertions(+), 2 deletions(-)
--- a/include/net/dst.h +++ b/include/net/dst.h @@ -313,8 +313,9 @@ static inline bool dst_hold_safe(struct * @skb: buffer * * If dst is not yet refcounted and not destroyed, grab a ref on it. + * Returns true if dst is refcounted. */ -static inline void skb_dst_force(struct sk_buff *skb) +static inline bool skb_dst_force(struct sk_buff *skb) { if (skb_dst_is_noref(skb)) { struct dst_entry *dst = skb_dst(skb); @@ -325,6 +326,8 @@ static inline void skb_dst_force(struct
skb->_skb_refdst = (unsigned long)dst; } + + return skb->_skb_refdst != 0UL; }
--- a/net/netfilter/nf_queue.c +++ b/net/netfilter/nf_queue.c @@ -174,6 +174,11 @@ static int __nf_queue(struct sk_buff *sk goto err; }
+ if (!skb_dst_force(skb) && state->hook != NF_INET_PRE_ROUTING) { + status = -ENETDOWN; + goto err; + } + *entry = (struct nf_queue_entry) { .skb = skb, .state = *state, @@ -182,7 +187,6 @@ static int __nf_queue(struct sk_buff *sk };
nf_queue_entry_get_refs(entry); - skb_dst_force(skb);
switch (entry->state.pf) { case AF_INET: