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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2022-05-05 10:53:53 +0900
committerJakub Kicinski <kuba@kernel.org>2022-05-05 16:44:49 -0700
commit6997fbd7a3dafa754f81d541498ace35b43246d8 (patch)
tree9903b4be70449cb3b8759040ed1b57bdf4d89ed4 /net/rds/tcp.h
parent68533eb1fb197a413fd8612ebb88e111ade3beac (diff)
downloadlinux-6997fbd7a3dafa754f81d541498ace35b43246d8.tar.bz2
net: rds: use maybe_get_net() when acquiring refcount on TCP sockets
Eric Dumazet is reporting addition on 0 problem at rds_tcp_tune(), for delayed works queued in rds_wq might be invoked after a net namespace's refcount already reached 0. Since rds_tcp_exit_net() from cleanup_net() calls flush_workqueue(rds_wq), it is guaranteed that we can instead use maybe_get_net() from delayed work functions until rds_tcp_exit_net() returns. Note that I'm not convinced that all works which might access a net namespace are already queued in rds_wq by the moment rds_tcp_exit_net() calls flush_workqueue(rds_wq). If some race is there, rds_tcp_exit_net() will fail to wait for work functions, and kmem_cache_free() could be called from net_free() before maybe_get_net() is called from rds_tcp_tune(). Reported-by: Eric Dumazet <edumazet@google.com> Fixes: 3a58f13a881ed351 ("net: rds: acquire refcount on TCP sockets") Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/41d09faf-bc78-1a87-dfd1-c6d1b5984b61@I-love.SAKURA.ne.jp Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/rds/tcp.h')
-rw-r--r--net/rds/tcp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rds/tcp.h b/net/rds/tcp.h
index dc8d745d6857..f8b5930d7b34 100644
--- a/net/rds/tcp.h
+++ b/net/rds/tcp.h
@@ -49,7 +49,7 @@ struct rds_tcp_statistics {
};
/* tcp.c */
-void rds_tcp_tune(struct socket *sock);
+bool rds_tcp_tune(struct socket *sock);
void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp);
void rds_tcp_reset_callbacks(struct socket *sock, struct rds_conn_path *cp);
void rds_tcp_restore_callbacks(struct socket *sock,