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From: <Heinrich.Toews@wago.com>
To: barebox@lists.infradead.org
Cc: Heinrich.Toews@wago.com
Subject: [PATCH] nand-bb: mtd_del_bb: fix missing pointer reset
Date: Mon, 18 Jun 2018 09:52:56 +0000	[thread overview]
Message-ID: <1529315540-10480-1-git-send-email-heinrich.toews@wago.com> (raw)

From: Töws, Heinrich <Heinrich.Toews@wago.com>

If an attached bb device was removed before the actual mtd device
the code would try due to a missing pointer reset to access
the no more present bb device handle which leads to a page fault.

This bug was made visible by commit "7649473 mtd: nand: remove
automatically created bb devices" which relys on a correct
mtd->cdev_bb handling.
---
 drivers/mtd/nand/nand-bb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mtd/nand/nand-bb.c b/drivers/mtd/nand/nand-bb.c
index c197738..012163e 100644
--- a/drivers/mtd/nand/nand-bb.c
+++ b/drivers/mtd/nand/nand-bb.c
@@ -316,6 +316,8 @@ void mtd_del_bb(struct mtd_info *mtd)
 	list_del_init(&bb->list);
 	free(bb->name);
 	free(bb);
+
+	mtd->cdev_bb = NULL;
 }
 
 /**
-- 
2.7.4
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             reply	other threads:[~2018-06-18  9:53 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-18  9:52 Heinrich.Toews [this message]
2018-06-18 10:48 ` [PATCH v2] " Heinrich.Toews
2018-06-18 20:54   ` Sascha Hauer

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