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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2016-10-19 15:53:01 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-21 11:27:31 -0400 |
| commit | e8f0a89cd7591c5d4eb7c77833af865b4db356b7 (patch) | |
| tree | 3dc3e1a0ff45a0b2182ead62097b19799a4d8305 /net | |
| parent | 9e58c5dc4be31f8cf3ff62d96f91c97af6f9d58e (diff) | |
| download | linux-e8f0a89cd7591c5d4eb7c77833af865b4db356b7.tar.gz | |
hv_netvsc: fix a race between netvsc_send() and netvsc_init_buf()
Fix in commit 880988348270 ("hv_netvsc: set nvdev link after populating
chn_table") turns out to be incomplete. A crash in
netvsc_get_next_send_section() is observed on mtu change when the device
is under load. The race I identified is: if we get to netvsc_send() after
we set net_device_ctx->nvdev link in netvsc_device_add() but before we
finish netvsc_connect_vsp()->netvsc_init_buf() send_section_map is not
allocated and we crash. Unfortunately we can't set net_device_ctx->nvdev
link after the netvsc_init_buf() call as during the negotiation we need
to receive packets and on the receive path we check for it. It would
probably be possible to split nvdev into a pair of nvdev_in and nvdev_out
links and check them accordingly in get_outbound_net_device()/
get_inbound_net_device() but this looks like an overkill.
Check that send_section_map is allocated in netvsc_send().
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions