Commit be1e4444 authored Aug 09, 2012 by J. Bruce Fields

svcrpc: fix BUG() in svc_tcp_clear_pages



Examination of svc_tcp_clear_pages shows that it assumes sk_tcplen is
consistent with sk_pages[] (in particular, sk_pages[n] can't be NULL if
sk_tcplen would lead us to expect n pages of data).

svc_tcp_restore_pages zeroes out sk_pages[] while leaving sk_tcplen.
This is OK, since both functions are serialized by XPT_BUSY.  However,
that means the inconsistency must be repaired before dropping XPT_BUSY.

Therefore we should be ensuring that svc_tcp_save_pages repairs the
problem before exiting svc_tcp_recv_record on error.

Symptoms were a BUG() in svc_tcp_clear_pages.

Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

parent 39307655

net/sunrpc/svcsock.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1129,9 +1129,9 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
		if (len >= 0)
		svsk->sk_tcplen += len;
		if (len != want) {
		svc_tcp_save_pages(svsk, rqstp);
		if (len < 0 && len != -EAGAIN)
		goto err_other;
		svc_tcp_save_pages(svsk, rqstp);
		dprintk("svc: incomplete TCP record (%d of %d)\n",
		svsk->sk_tcplen, svsk->sk_reclen);
		goto err_noclose;