提交 cf3aa02c 编写于 作者: J J. Bruce Fields

svcrpc: fix handling of too-short rpc's

If we detect that an rpc is too short, we abort and close the
connection.  Except, there's a bug here: we're leaving sk_datalen
nonzero without leaving any pages in the sk_pages array.  The most
likely result of the inconsistency is a subsequent crash in
svc_tcp_clear_pages.

Also demote the BUG_ON in svc_tcp_clear_pages to a WARN.

Cc: stable@kernel.org
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
上级 590b7431
......@@ -917,7 +917,10 @@ static void svc_tcp_clear_pages(struct svc_sock *svsk)
len = svsk->sk_datalen;
npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
for (i = 0; i < npages; i++) {
BUG_ON(svsk->sk_pages[i] == NULL);
if (svsk->sk_pages[i] == NULL) {
WARN_ON_ONCE(1);
continue;
}
put_page(svsk->sk_pages[i]);
svsk->sk_pages[i] = NULL;
}
......@@ -1092,8 +1095,10 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
goto err_noclose;
}
if (svc_sock_reclen(svsk) < 8)
if (svc_sock_reclen(svsk) < 8) {
svsk->sk_datalen = 0;
goto err_delete; /* client is nuts. */
}
rqstp->rq_arg.len = svsk->sk_datalen;
rqstp->rq_arg.page_base = 0;
......
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