linux-kernel - Re: [PATCH] ubifs: fix memory leak from c->sup

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Message-ID: <CAFLxGvwaabOGTLjEYUg2qdnjtbr_nnGXzBq-5rCzRpqvf-OQbQ@mail.gmail.com>
Date:   Fri, 17 Jan 2020 00:54:00 +0100
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     quanyang.wang@...driver.com, Richard Weinberger <richard@....at>,
        linux-mtd@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ubifs: fix memory leak from c->sup_node

On Tue, Jan 14, 2020 at 10:21 AM Sascha Hauer <s.hauer@...gutronix.de> wrote:
>
> On Tue, Jan 14, 2020 at 01:43:11PM +0800, quanyang.wang@...driver.com wrote:
> > From: Quanyang Wang <quanyang.wang@...driver.com>
> >
> > The c->sup_node is allocated in function ubifs_read_sb_node but
> > is not freed. This will cause memory leak as below:
> >
> > unreferenced object 0xbc9ce000 (size 4096):
> >   comm "mount", pid 500, jiffies 4294952946 (age 315.820s)
> >   hex dump (first 32 bytes):
> >     31 18 10 06 06 7b f1 11 02 00 00 00 00 00 00 00  1....{..........
> >     00 10 00 00 06 00 00 00 00 00 00 00 08 00 00 00  ................
> >   backtrace:
> >     [<d1c503cd>] ubifs_read_superblock+0x48/0xebc
> >     [<a20e14bd>] ubifs_mount+0x974/0x1420
> >     [<8589ecc3>] legacy_get_tree+0x2c/0x50
> >     [<5f1fb889>] vfs_get_tree+0x28/0xfc
> >     [<bbfc7939>] do_mount+0x4f8/0x748
> >     [<4151f538>] ksys_mount+0x78/0xa0
> >     [<d59910a9>] ret_fast_syscall+0x0/0x54
> >     [<1cc40005>] 0x7ea02790
> >
> > Free it in ubifs_umount and in the error path of mount_ubifs.
> >
> > Fixes: fd6150051bec ("ubifs: Store read superblock node")
> > Signed-off-by: Quanyang Wang <quanyang.wang@...driver.com>
>
> Looks good.
>
> Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>

Hm, this one is not in patchwork.
Anyway, applied. Thanks for fixing!

-- 
Thanks,
//richard