tree 465f41f6c4e0e63c58a94c893d0b4ec5c5e7a10d
parent f2b2ea692ec01768c77a4f532dcd060316460122
author Mike Snitzer <snitzer@gmail.com> 1207166687 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1207175299 -0700

nbd: prevent sock_xmit from attempting to use a NULL socket

NBD does not protect the nbd_device's socket from becoming NULL during
receives.

This closes a race with the NBD_CLEAR_SOCK ioctl (nbd-client -d) setting
the nbd_device's socket to NULL right before NBD calls sock_xmit.

Signed-off-by: Mike Snitzer <snitzer@gmail.com>
Cc: Paul Clements <paul.clements@steeleye.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>