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xenbus_dev: add missing error check to watch handling 

So far only the watch path was checked to be zero terminated, while
the watch token was merely assumed to be.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Jan Beulich 2012-01-24 13:52:42 +00:00 committed by Konrad Rzeszutek Wilk
parent e4de866a83
commit a43a5ccdfa
1 changed files with 4 additions and 0 deletions
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4
drivers/xen/xenbus/xenbus_dev_frontend.c
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@ -369,6 +369,10 @@ static int xenbus_write_watch(unsigned msg_type, struct xenbus_file_priv *u)
goto out;
}
token++;
if (memchr(token, 0, u->u.msg.len - (token - path)) == NULL) {
rc = -EILSEQ;
goto out;
}
if (msg_type == XS_WATCH) {
watch = alloc_watch_adapter(path, token);