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author | Eric Dumazet <edumazet@google.com> | 2015-09-30 01:52:25 (GMT) |
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committer | David S. Miller <davem@davemloft.net> | 2015-10-17 12:01:11 (GMT) |
commit | c7c49b8fde26b74277188bdc6c9dca38db6fa35b (patch) | |
tree | 27ac5d0c1469aeacade0db5540362e8e9772b6b4 /drivers | |
parent | 5f715c097965c0ad037f64393d0b95c50287775b (diff) | |
download | linux-c7c49b8fde26b74277188bdc6c9dca38db6fa35b.tar.xz |
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 'drivers')
0 files changed, 0 insertions, 0 deletions