diff options
author | Willem de Bruijn <willemb@google.com> | 2019-05-15 13:29:16 -0400 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-25 18:25:16 +0200 |
commit | 723fdfbab894cae0ac1d231f07bff709fbf598ba (patch) | |
tree | 9b2bcd53d38aa55dfda8ec46e53bf4f86505ad6a /include/linux/skbuff.h | |
parent | 00b0f63783c32820b5f4b1ae0c63c6227e613261 (diff) |
net: test nouarg before dereferencing zerocopy pointers
[ Upstream commit 185ce5c38ea76f29b6bd9c7c8c7a5e5408834920 ]
Zerocopy skbs without completion notification were added for packet
sockets with PACKET_TX_RING user buffers. Those signal completion
through the TP_STATUS_USER bit in the ring. Zerocopy annotation was
added only to avoid premature notification after clone or orphan, by
triggering a copy on these paths for these packets.
The mechanism had to define a special "no-uarg" mode because packet
sockets already use skb_uarg(skb) == skb_shinfo(skb)->destructor_arg
for a different pointer.
Before deferencing skb_uarg(skb), verify that it is a real pointer.
Fixes: 5cd8d46ea1562 ("packet: copy user buffers before orphan or clone")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r-- | include/linux/skbuff.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 3172e14d9398..fdb0cd0699b6 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1310,10 +1310,12 @@ static inline void skb_zcopy_clear(struct sk_buff *skb, bool zerocopy) struct ubuf_info *uarg = skb_zcopy(skb); if (uarg) { - if (uarg->callback == sock_zerocopy_callback) { + if (skb_zcopy_is_nouarg(skb)) { + /* no notification callback */ + } else if (uarg->callback == sock_zerocopy_callback) { uarg->zerocopy = uarg->zerocopy && zerocopy; sock_zerocopy_put(uarg); - } else if (!skb_zcopy_is_nouarg(skb)) { + } else { uarg->callback(uarg, zerocopy); } @@ -2572,7 +2574,8 @@ static inline int skb_orphan_frags(struct sk_buff *skb, gfp_t gfp_mask) { if (likely(!skb_zcopy(skb))) return 0; - if (skb_uarg(skb)->callback == sock_zerocopy_callback) + if (!skb_zcopy_is_nouarg(skb) && + skb_uarg(skb)->callback == sock_zerocopy_callback) return 0; return skb_copy_ubufs(skb, gfp_mask); } |