CVS commit: src/sys/arch/xen/xen

["Jean-Yves Migeon" <jym%netbsd.org@localhost>]

Module Name:    src
Committed By:   jym
Date:           Wed Aug 24 20:49:34 UTC 2011

Modified Files:
        src/sys/arch/xen/xen: xbdback_xenbus.c

Log Message:
Protect xbdback(4) ring indexes from overflowing; leave the continuation
prematurely in case they do, to avoid looping "endlessly" (or at least
a very long time) at IPL_BIO while trying to handle requests.

This should not happen in a nominal scenario, but the ring can get
corrupted for whatever reason (memory errors, domU failures or
exploitation).


To generate a diff of this commit:
cvs rdiff -u -r1.45 -r1.46 src/sys/arch/xen/xen/xbdback_xenbus.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.