linux-kernel - [patch] drbd: potential null dereference

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Message-ID: <20100327145950.GG5069@bicker>
Date:	Sat, 27 Mar 2010 17:59:50 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Lars Ellenberg <drbd-dev@...ts.linbit.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	drbd-user@...ts.linbit.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] drbd: potential null dereference

If "e" is NULL then "bm_ext" would be NULL too.

Signed-off-by: Dan Carpenter <error27@...il.com>
---
Found by static analysis and compile tested only.  Sorry.  :/

diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 17956ff..b68b778 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -1328,7 +1328,7 @@ int drbd_rs_del_all(struct drbd_conf *mdev)
 		for (i = 0; i < mdev->resync->nr_elements; i++) {
 			e = lc_element_by_index(mdev->resync, i);
 			bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
-			if (bm_ext->lce.lc_number == LC_FREE)
+			if (!bm_ext || bm_ext->lce.lc_number == LC_FREE)
 				continue;
 			if (bm_ext->lce.lc_number == mdev->resync_wenr) {
 				dev_info(DEV, "dropping %u in drbd_rs_del_all, apparently"
--
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