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authorEric Dumazet <edumazet@google.com>2015-09-29 18:52:25 -0700
committerDavid S. Miller <davem@davemloft.net>2015-10-17 05:01:11 -0700
commitc7c49b8fde26b74277188bdc6c9dca38db6fa35b (patch)
tree27ac5d0c1469aeacade0db5540362e8e9772b6b4 /net/netlink
parent5f715c097965c0ad037f64393d0b95c50287775b (diff)
net: add pfmemalloc check in sk_add_backlog()
Greg reported crashes hitting the following check in __sk_backlog_rcv() BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); The pfmemalloc bit is currently checked in sk_filter(). This works correctly for TCP, because sk_filter() is ran in tcp_v[46]_rcv() before hitting the prequeue or backlog checks. For UDP or other protocols, this does not work, because the sk_filter() is ran from sock_queue_rcv_skb(), which might be called _after_ backlog queuing if socket is owned by user by the time packet is processed by softirq handler. Fixes: b4b9e35585089 ("netvm: set PF_MEMALLOC as appropriate during SKB processing") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Greg Thelen <gthelen@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink')
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