linux-kernel - [PATCH 4.4 14/42] svcrpc: dont leak contexts on PROC

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Message-Id: <20170124075509.898333921@linuxfoundation.org>
Date:   Tue, 24 Jan 2017 08:55:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Andy Adamson <andros@...app.com>,
        "J. Bruce Fields" <bfields@...hat.com>
Subject: [PATCH 4.4 14/42] svcrpc: dont leak contexts on PROC_DESTROY

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: J. Bruce Fields <bfields@...hat.com>

commit 78794d1890708cf94e3961261e52dcec2cc34722 upstream.

Context expiry times are in units of seconds since boot, not unix time.

The use of get_seconds() here therefore sets the expiry time decades in
the future.  This prevents timely freeing of contexts destroyed by
client RPC_GSS_PROC_DESTROY requests.  We'd still free them eventually
(when the module is unloaded or the container shut down), but a lot of
contexts could pile up before then.

Fixes: c5b29f885afe "sunrpc: use seconds since boot in expiry cache"
Reported-by: Andy Adamson <andros@...app.com>
Signed-off-by: J. Bruce Fields <bfields@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/sunrpc/auth_gss/svcauth_gss.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sunrpc/auth_gss/svcauth_gss.c
+++ b/net/sunrpc/auth_gss/svcauth_gss.c
@@ -1481,7 +1481,7 @@ svcauth_gss_accept(struct svc_rqst *rqst
 	case RPC_GSS_PROC_DESTROY:
 		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
 			goto auth_err;
-		rsci->h.expiry_time = get_seconds();
+		rsci->h.expiry_time = seconds_since_boot();
 		set_bit(CACHE_NEGATIVE, &rsci->h.flags);
 		if (resv->iov_len + 4 > PAGE_SIZE)
 			goto drop;