linux-kernel - [PATCH -next 1/2] jffs2: fix memory leak in jffs2_do_mount

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Message-ID: <20211230065215.3747576-2-libaokun1@huawei.com>
Date:   Thu, 30 Dec 2021 14:52:14 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <richard@....at>, <dwmw2@...radead.org>, <lizhe67@...wei.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     <libaokun1@...wei.com>, <yukuai3@...wei.com>,
        <stable@...r.kernel.org>
Subject: [PATCH -next 1/2] jffs2: fix memory leak in jffs2_do_mount_fs

If jffs2_build_filesystem() in jffs2_do_mount_fs() returns an error,
we can observe the following kmemleak report:

--------------------------------------------
unreferenced object 0xffff88811b25a640 (size 64):
  comm "mount", pid 691, jiffies 4294957728 (age 71.952s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffffa493be24>] kmem_cache_alloc_trace+0x584/0x880
    [<ffffffffa5423a06>] jffs2_sum_init+0x86/0x130
    [<ffffffffa5400e58>] jffs2_do_mount_fs+0x798/0xac0
    [<ffffffffa540acf3>] jffs2_do_fill_super+0x383/0xc30
    [<ffffffffa540c00a>] jffs2_fill_super+0x2ea/0x4c0
    [...]
unreferenced object 0xffff88812c760000 (size 65536):
  comm "mount", pid 691, jiffies 4294957728 (age 71.952s)
  hex dump (first 32 bytes):
    bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb  ................
    bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb  ................
  backtrace:
    [<ffffffffa493a449>] __kmalloc+0x6b9/0x910
    [<ffffffffa5423a57>] jffs2_sum_init+0xd7/0x130
    [<ffffffffa5400e58>] jffs2_do_mount_fs+0x798/0xac0
    [<ffffffffa540acf3>] jffs2_do_fill_super+0x383/0xc30
    [<ffffffffa540c00a>] jffs2_fill_super+0x2ea/0x4c0
    [...]
--------------------------------------------

This is because the resources allocated in jffs2_sum_init() are not
released. Call jffs2_sum_exit() to release these resources to solve
the problem.

Fixes: e631ddba5887 ("[JFFS2] Add erase block summary support (mount time improvement)")
Cc: stable@...r.kernel.org
Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
 fs/jffs2/build.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/jffs2/build.c b/fs/jffs2/build.c
index b288c8ae1236..837cd55fd4c5 100644
--- a/fs/jffs2/build.c
+++ b/fs/jffs2/build.c
@@ -415,13 +415,15 @@ int jffs2_do_mount_fs(struct jffs2_sb_info *c)
 		jffs2_free_ino_caches(c);
 		jffs2_free_raw_node_refs(c);
 		ret = -EIO;
-		goto out_free;
+		goto out_sum_exit;
 	}
 
 	jffs2_calc_trigger_levels(c);
 
 	return 0;
 
+ out_sum_exit:
+	jffs2_sum_exit(c);
  out_free:
 	kvfree(c->blocks);
 
-- 
2.31.1