inet: frags: better deal with smp races

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[ Upstream commit 0d5b9311ba ]

Multiple cpus might attempt to insert a new fragment in rhashtable,
if for example RPS is buggy, as reported by 배석진 in
https://patchwork.ozlabs.org/patch/994601/

We use rhashtable_lookup_get_insert_key() instead of
rhashtable_insert_fast() to let cpus losing the race
free their own inet_frag_queue and use the one that
was inserted by another cpu.

Fixes: 648700f76b ("inet: frags: use rhashtables for reassembly units")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: 배석진 <soukjin.bae@samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eric Dumazet 2018-11-08 17:34:27 -08:00 • committed by Greg Kroah-Hartman

parent 642e1d8a42

commit 115973a608

1 changed files with 15 additions and 14 deletions

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net/ipv4/inet_fragment.c

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