netdev - Re: [PATCH net] tipc: block BH before using dst

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Message-Id: <20200522.153958.1756967784732800385.davem@davemloft.net>
Date:   Fri, 22 May 2020 15:39:58 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        lucien.xin@...il.com, jon.maloy@...csson.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH net] tipc: block BH before using dst_cache

From: Eric Dumazet <edumazet@...gle.com>
Date: Thu, 21 May 2020 11:29:58 -0700

> dst_cache_get() documents it must be used with BH disabled.
> 
> sysbot reported :
> 
> BUG: using smp_processor_id() in preemptible [00000000] code: /21697
> caller is dst_cache_get+0x3a/0xb0 net/core/dst_cache.c:68
 ...
> Fixes: e9c1a793210f ("tipc: add dst_cache support for udp media")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Applied and queued up for -stable, thanks.