From: Dan Carpenter <dan.carpenter@oracle.com>
To: Song Liu <song@kernel.org>, Guoqing Jiang <gqjiang@suse.com>
Cc: Shaohua Li <shli@fb.com>, NeilBrown <neilb@suse.com>,
linux-raid@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] md-cluster: Fix potential error pointer dereference in resize_bitmaps()
Date: Tue, 4 Aug 2020 13:16:45 +0300 [thread overview]
Message-ID: <20200804101645.GB392148@mwanda> (raw)
The error handling calls md_bitmap_free(bitmap) which checks for NULL
but will Oops if we pass an error pointer. Let's set "bitmap" to NULL
on this error path.
Fixes: afd756286083 ("md-cluster/raid10: resize all the bitmaps before start reshape")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/md/md-cluster.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index 73fd50e77975..d50737ec4039 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1139,6 +1139,7 @@ static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsiz
bitmap = get_bitmap_from_slot(mddev, i);
if (IS_ERR(bitmap)) {
pr_err("can't get bitmap from slot %d\n", i);
+ bitmap = NULL;
goto out;
}
counts = &bitmap->counts;
--
2.27.0
next reply other threads:[~2020-08-04 10:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-04 10:16 Dan Carpenter [this message]
2020-08-04 10:40 ` [PATCH] md-cluster: Fix potential error pointer dereference in resize_bitmaps() Guoqing Jiang
2020-08-04 11:15 ` Dan Carpenter
2020-08-06 0:20 ` Song Liu
2020-10-03 15:57 ` heming.zhao
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