git: kernel - Fix possible race in syncache
commit c1d0893d667ee18127bd3d2e371b820d65c5c0c2
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Wed Aug 18 12:22:49 2010 -0700
kernel - Fix possible race in syncache
* syncache_timer_handler() can block while dropping a syncache entry,
potentially causing the next pointer it uses in its list iteration
to become stale.
* Use a list marker to keep tabs on the list position instead of using
a next pointer.
* Remove critical sections, callouts do not preempt and syncache
routines can only be entered from protocol threads or callouts.
* Document the callout code as not preempting other threads.
Reported-by: Peter Avalos <pavalos@theshell.com>
Summary of changes:
sys/kern/kern_timeout.c | 19 ++++---------
sys/netinet/tcp_syncache.c | 63 +++++++++++++++++++++++++++----------------
sys/netinet/tcp_var.h | 1 +
3 files changed, 46 insertions(+), 37 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/c1d0893d667ee18127bd3d2e371b820d65c5c0c2
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