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author | Paolo Abeni <pabeni@redhat.com> | 2021-06-09 12:49:01 +0300 |
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committer | David S. Miller <davem@davemloft.net> | 2021-06-10 00:08:41 +0300 |
commit | a8b897c7bcd47f4147d066e22cc01d1026d7640e (patch) | |
tree | f8423df1a5a624483c4cbd8c53fc7e0c05708fab /net/sched/act_ct.c | |
parent | dcd01eeac14486b56a790f5cce9b823440ba5b34 (diff) | |
download | linux-a8b897c7bcd47f4147d066e22cc01d1026d7640e.tar.xz |
udp: fix race between close() and udp_abort()
Kaustubh reported and diagnosed a panic in udp_lib_lookup().
The root cause is udp_abort() racing with close(). Both
racing functions acquire the socket lock, but udp{v6}_destroy_sock()
release it before performing destructive actions.
We can't easily extend the socket lock scope to avoid the race,
instead use the SOCK_DEAD flag to prevent udp_abort from doing
any action when the critical race happens.
Diagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>
Fixes: 5d77dca82839 ("net: diag: support SOCK_DESTROY for UDP sockets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_ct.c')
0 files changed, 0 insertions, 0 deletions