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authorEric Dumazet <edumazet@google.com>2018-11-25 19:26:23 +0300
committerDavid S. Miller <davem@davemloft.net>2018-11-25 21:36:19 +0300
commit4bffc669d6248d655aeb985a0e51bfaaf21c8b40 (patch)
tree4e60ee772adb097ec25619769dcf4e02d8829fcb /net/core/skbuff.c
parent40b1c813ba8e0aac9ee36b57f2835777506084c6 (diff)
downloadlinux-4bffc669d6248d655aeb985a0e51bfaaf21c8b40.tar.xz
net: remove unsafe skb_insert()
I do not see how one can effectively use skb_insert() without holding some kind of lock. Otherwise other cpus could have changed the list right before we have a chance of acquiring list->lock. Only existing user is in drivers/infiniband/hw/nes/nes_mgt.c and this one probably meant to use __skb_insert() since it appears nesqp->pau_list is protected by nesqp->pau_lock. This looks like nesqp->pau_lock could be removed, since nesqp->pau_list.lock could be used instead. Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Faisal Latif <faisal.latif@intel.com> Cc: Doug Ledford <dledford@redhat.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: linux-rdma <linux-rdma@vger.kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/skbuff.c')
-rw-r--r--net/core/skbuff.c22
1 files changed, 0 insertions, 22 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 9a8a72cefe9b..02cd7ae3d0fb 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -2990,28 +2990,6 @@ void skb_append(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head
}
EXPORT_SYMBOL(skb_append);
-/**
- * skb_insert - insert a buffer
- * @old: buffer to insert before
- * @newsk: buffer to insert
- * @list: list to use
- *
- * Place a packet before a given packet in a list. The list locks are
- * taken and this function is atomic with respect to other list locked
- * calls.
- *
- * A buffer cannot be placed on two lists at the same time.
- */
-void skb_insert(struct sk_buff *old, struct sk_buff *newsk, struct sk_buff_head *list)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&list->lock, flags);
- __skb_insert(newsk, old->prev, old, list);
- spin_unlock_irqrestore(&list->lock, flags);
-}
-EXPORT_SYMBOL(skb_insert);
-
static inline void skb_split_inside_header(struct sk_buff *skb,
struct sk_buff* skb1,
const u32 len, const int pos)