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| author | Steffen Klassert <steffen.klassert@secunet.com> | 2017-08-25 08:16:07 +0300 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2017-08-25 10:26:12 +0300 |
| commit | 36ff0dd39f9b88ca83e1733b735e9f22b7be893b (patch) | |
| tree | 4630219935215d5488958b705ee3a84ffccf17bf /net/ipv4/esp4.c | |
| parent | 8a4b5784fac2af93ad6a8c08fb56d021e0c0416b (diff) | |
| download | linux-36ff0dd39f9b88ca83e1733b735e9f22b7be893b.tar.xz | |
esp: Fix locking on page fragment allocation
We allocate the page fragment for the ESP trailer inside
a spinlock, but consume it outside of the lock. This
is racy as some other cou could get the same page fragment
then. Fix this by consuming the page fragment inside the
lock too.
Fixes: cac2661c53f3 ("esp4: Avoid skb_cow_data whenever possible")
Fixes: 03e2a30f6a27 ("esp6: Avoid skb_cow_data whenever possible")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/ipv4/esp4.c')
| -rw-r--r-- | net/ipv4/esp4.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index dbb31a942dfa..a8ddb95e7f06 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -292,8 +292,6 @@ int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info * kunmap_atomic(vaddr); - spin_unlock_bh(&x->lock); - nfrags = skb_shinfo(skb)->nr_frags; __skb_fill_page_desc(skb, nfrags, page, pfrag->offset, @@ -301,6 +299,9 @@ int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info * skb_shinfo(skb)->nr_frags = ++nfrags; pfrag->offset = pfrag->offset + allocsize; + + spin_unlock_bh(&x->lock); + nfrags++; skb->len += tailen; |