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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2022-11-29 19:48:09 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-12-02 07:26:21 +0300 |
| commit | 5aa2820177af650293b2f9f1873c1f6f8e4ad7a4 (patch) | |
| tree | 41d0ba065d1e740895121a095a1811a42bb565c1 /net/hsr | |
| parent | e012764cebf6e33097f6833ff15a936fbe7b846c (diff) | |
| download | linux-5aa2820177af650293b2f9f1873c1f6f8e4ad7a4.tar.xz | |
hsr: Add a rcu-read lock to hsr_forward_skb().
hsr_forward_skb() a skb and keeps information in an on-stack
hsr_frame_info. hsr_get_node() assigns hsr_frame_info::node_src which is
from a RCU list. This pointer is used later in hsr_forward_do().
I don't see a reason why this pointer can't vanish midway since there is
no guarantee that hsr_forward_skb() is invoked from an RCU read section.
Use rcu_read_lock() to protect hsr_frame_info::node_src from its
assignment until it is no longer used.
Fixes: f266a683a4804 ("net/hsr: Better frame dispatch")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/hsr')
| -rw-r--r-- | net/hsr/hsr_forward.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index 3e58d310b4d4..a8befa35841e 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -614,11 +614,13 @@ void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) { struct hsr_frame_info frame; + rcu_read_lock(); if (fill_frame_info(&frame, skb, port) < 0) goto out_drop; hsr_register_frame_in(frame.node_src, port, frame.sequence_nr); hsr_forward_do(&frame); + rcu_read_unlock(); /* Gets called for ingress frames as well as egress from master port. * So check and increment stats for master port only here. */ @@ -633,6 +635,7 @@ void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) return; out_drop: + rcu_read_unlock(); port->dev->stats.tx_dropped++; kfree_skb(skb); } |