summaryrefslogtreecommitdiffstats
path: root/net/core
diff options
context:
space:
mode:
authorWillem de Bruijn <willemb@google.com>2017-12-20 17:37:50 -0500
committerDavid S. Miller <davem@davemloft.net>2017-12-21 15:00:58 -0500
commitb90ddd568792bcb0054eaf0f61785c8f80c3bd1c (patch)
tree15019f6f3ff507c87e3b3d6455a6993489e0d49e /net/core
parent268b790679422a89e9ab0685d9f291edae780c98 (diff)
downloadlinux-b90ddd568792bcb0054eaf0f61785c8f80c3bd1c.tar.bz2
skbuff: skb_copy_ubufs must release uarg even without user frags
skb_copy_ubufs creates a private copy of frags[] to release its hold on user frags, then calls uarg->callback to notify the owner. Call uarg->callback even when no frags exist. This edge case can happen when zerocopy_sg_from_iter finds enough room in skb_headlen to copy all the data. Fixes: 3ece782693c4 ("sock: skb_copy_ubufs support for compound pages") Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/skbuff.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index edf40ac0cd07..a3cb0be4c6f3 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1178,7 +1178,7 @@ int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
u32 d_off;
if (!num_frags)
- return 0;
+ goto release;
if (skb_shared(skb) || skb_unclone(skb, gfp_mask))
return -EINVAL;
@@ -1238,6 +1238,7 @@ int skb_copy_ubufs(struct sk_buff *skb, gfp_t gfp_mask)
__skb_fill_page_desc(skb, new_frags - 1, head, 0, d_off);
skb_shinfo(skb)->nr_frags = new_frags;
+release:
skb_zcopy_clear(skb, false);
return 0;
}