korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-25 13:14:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

net/unix: fix logic about sk_peek_offset

Browse Source 
Now send with MSG_PEEK can return data from multiple SKBs.

Unfortunately we take into account the peek offset for each skb,
that is wrong. We need to apply the peek offset only once.

In addition, the peek offset should be used only if MSG_PEEK is set.

Cc: "David S. Miller" <davem@davemloft.net> (maintainer:NETWORKING
Cc: Eric Dumazet <edumazet@google.com> (commit_signer:1/14=7%)
Cc: Aaron Conole <aconole@bytheb.org>
Fixes: 9f389e3567 ("af_unix: return data from multiple SKBs on recv() with MSG_PEEK flag")
Signed-off-by: Andrey Vagin <avagin@openvz.org>
Tested-by: Aaron Conole <aconole@bytheb.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Vagin 2015-10-02 00:05:36 +03:00 committed by David S. Miller
parent 215c90afb9
commit e9193d60d3
1 changed files with 7 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
net/unix/af_unix.c
View File

@ -2064,6 +2064,11 @@ static int unix_stream_read_generic(struct unix_stream_read_state *state)
goto out;
}
if (flags & MSG_PEEK)
skip = sk_peek_offset(sk, flags);
else
skip = 0;
do {
int chunk;
struct sk_buff *skb, *last;
@ -2112,7 +2117,6 @@ unlock:
break;
}
skip = sk_peek_offset(sk, flags);
while (skip >= unix_skb_len(skb)) {
skip -= unix_skb_len(skb);
last = skb;
@ -2179,14 +2183,12 @@ unlock:
if (UNIXCB(skb).fp)
scm.fp = scm_fp_dup(UNIXCB(skb).fp);
if (skip) {
sk_peek_offset_fwd(sk, chunk);
skip -= chunk;
}
sk_peek_offset_fwd(sk, chunk);
if (UNIXCB(skb).fp)
break;
skip = 0;
last = skb;
last_len = skb->len;
unix_state_lock(sk);