linux-kernel - [PATCH 4.9 03/95] ubi: fastmap: Dont flush fastmap work on detach

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Message-Id: <20180422135210.576881043@linuxfoundation.org>
Date:   Sun, 22 Apr 2018 15:52:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Martin Townsend <mtownsend1973@...il.com>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 4.9 03/95] ubi: fastmap: Dont flush fastmap work on detach

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

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

From: Richard Weinberger <richard@....at>

commit 29b7a6fa1ec07e8480b0d9caf635a4498a438bf4 upstream.

At this point UBI volumes have already been free()'ed and fastmap can no
longer access these data structures.

Reported-by: Martin Townsend <mtownsend1973@...il.com>
Fixes: 74cdaf24004a ("UBI: Fastmap: Fix memory leaks while closing the WL sub-system")
Cc: stable@...r.kernel.org
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/ubi/fastmap-wl.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/mtd/ubi/fastmap-wl.c
+++ b/drivers/mtd/ubi/fastmap-wl.c
@@ -362,7 +362,6 @@ static void ubi_fastmap_close(struct ubi
 {
 	int i;
 
-	flush_work(&ubi->fm_work);
 	return_unused_pool_pebs(ubi, &ubi->fm_pool);
 	return_unused_pool_pebs(ubi, &ubi->fm_wl_pool);