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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2015-09-18 14:16:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-09-21 08:55:31 +0300 |
| commit | 1f770c0a09da855a2b51af6d19de97fb955eca85 (patch) | |
| tree | eeb43c3ce6917390ce6e55b48990d2ba32aaf9cc /virt | |
| parent | 3ea79249e81e5ed051f2e6480cbde896d99046e8 (diff) | |
| download | linux-1f770c0a09da855a2b51af6d19de97fb955eca85.tar.xz | |
netlink: Fix autobind race condition that leads to zero port ID
The commit c0bb07df7d981e4091432754e30c9c720e2c0c78 ("netlink:
Reset portid after netlink_insert failure") introduced a race
condition where if two threads try to autobind the same socket
one of them may end up with a zero port ID. This led to kernel
deadlocks that were observed by multiple people.
This patch reverts that commit and instead fixes it by introducing
a separte rhash_portid variable so that the real portid is only set
after the socket has been successfully hashed.
Fixes: c0bb07df7d98 ("netlink: Reset portid after netlink_insert failure")
Reported-by: Tejun Heo <tj@kernel.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions