cvs commit: src/sys/net bpf.c
rwatson at FreeBSD.org
Wed Sep 8 21:11:13 PDT 2004
rwatson 2004-09-09 04:11:12 UTC
FreeBSD src repository
Reformulate bpf_dettachd() to acquire the BIF_LOCK() as well as
BPFD_LOCK() when removing a descriptor from an interface descriptor
list. Hold both over the operation, and do a better job at
maintaining the invariant that you can't find partially connected
descriptors on an active interface descriptor list.
This appears to close a race that resulted in the kernel performing
a NULL pointer dereference when BPF sessions are detached during
heavy network activity on SMP systems.
Revision Changes Path
1.136 +20 -11 src/sys/net/bpf.c
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