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net: udp: annotate data race around udp_sk(sk)->corkflag

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commit a9f5970767d11eadc805d5283f202612c7ba1f59 upstream.

up->corkflag field can be read or written without any lock.
Annotate accesses to avoid possible syzbot/KCSAN reports.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet
2021-09-27 17:29:24 -07:00
committed by Greg Kroah-Hartman
parent a7f4c633ae
commit 5c3a90b6ff
2 changed files with 6 additions and 6 deletions
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2
net/ipv6/udp.c
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@@ -1288,7 +1288,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
int addr_len = msg->msg_namelen;
bool connected = false;
int ulen = len;
int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE;
int err;
int is_udplite = IS_UDPLITE(sk);
int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);