hsr: Add a rcu-read lock to hsr_forward_skb().

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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: f266a683a4 ("net/hsr: Better frame dispatch")
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Sebastian Andrzej Siewior 2022-11-29 17:48:09 +01:00 • committed by Jakub Kicinski

parent e012764ceb

commit 5aa2820177

1 changed files with 3 additions and 0 deletions

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net/hsr/hsr_forward.c

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