linux-kernel - [PATCH 0/2] Fix use-after-free and kmemleak in ubi_resize

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Date:   Fri, 21 Oct 2022 18:21:55 +0800
From:   Li Zetao <lizetao1@...wei.com>
To:     <richard@....at>, <miquel.raynal@...tlin.com>, <vigneshr@...com>,
        <dedekind@...utronix.de>, <haver@...t.ibm.com>,
        <bbrezillon@...nel.org>
CC:     <lizetao1@...wei.com>, <boris.brezillon@...e-electrons.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/2] Fix use-after-free and kmemleak in ubi_resize_volume()

This patchset fixes two memory usage issues.

Patch 1 resolves the use-after-free issue, this is happening in volume 
resizing failed. In volume resizing process, the old eba table will be
replaced by the new. But on error handing patch, the old eba will be 
freed, which causing an use-after-free fault when resizing volume
next time.

Patch 2 resolves the kmemleak issue, this is also happening in volume
resizing failed. "new_eba_tbl" is created by ubi_eba_create_table() 
but destroyed by kfree().

Li Zetao (2):
  ubi: Fix use-after-free when volume resizing failed
  ubi: Fix unreferenced object reported by kmemleak in
    ubi_resize_volume()

 drivers/mtd/ubi/vmt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

-- 
2.31.1