linux-kernel - [PATCH 16/17] drbd: abort drbd_start

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Date:   Thu, 24 Aug 2017 23:23:13 +0200
From:   Philipp Reisner <philipp.reisner@...bit.com>
To:     Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:     drbd-dev@...ts.linbit.com
Subject: [PATCH 16/17] drbd: abort drbd_start_resync if there is no connection

From: Roland Kammerer <roland.kammerer@...bit.com>

This was found by a static analysis tool. While highly unlikely, be sure
to return without dereferencing the NULL pointer.

Reported-by: Shaobo <shaobo@...utah.edu>
Signed-off-by: Philipp Reisner <philipp.reisner@...bit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@...bit.com>

diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index f0717a9..03471b3 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -1756,6 +1756,11 @@ void drbd_start_resync(struct drbd_device *device, enum drbd_conns side)
 		return;
 	}
 
+	if (!connection) {
+		drbd_err(device, "No connection to peer, aborting!\n");
+		return;
+	}
+
 	if (!test_bit(B_RS_H_DONE, &device->flags)) {
 		if (side == C_SYNC_TARGET) {
 			/* Since application IO was locked out during C_WF_BITMAP_T and
-- 
2.7.4