diff options
| author | Willem de Bruijn <willemb@google.com> | 2018-05-17 13:13:29 -0400 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2019-05-03 19:24:02 +0200 |
| commit | 02e82059a1f427a0bf2936e76c3eabe1928fd152 (patch) | |
| tree | 3d0adc3e24807fb48ad982ecd41250563cfd60b7 /net/ipv4 | |
| parent | 667d4bd1d3ed7bf65a56f1e8e05d61dc4492cccb (diff) | |
net: test tailroom before appending to linear skb
commit 113f99c3358564a0647d444c2ae34e8b1abfd5b9 upstream.
Device features may change during transmission. In particular with
corking, a device may toggle scatter-gather in between allocating
and writing to an skb.
Do not unconditionally assume that !NETIF_F_SG at write time implies
that the same held at alloc time and thus the skb has sufficient
tailroom.
This issue predates git history.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Change-Id: Ibec3b9476df1288e95e66b40b5fd9a5b3d0cb8eb
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_output.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index fdbe72f11..5f06389bb 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -985,7 +985,8 @@ alloc_new_skb: if (copy > length) copy = length; - if (!(rt->dst.dev->features&NETIF_F_SG)) { + if (!(rt->dst.dev->features&NETIF_F_SG) && + skb_tailroom(skb) >= copy) { unsigned int off; off = skb->len; |