linux-ext4 - Re: [PATCH] ext4: Fix missing iput for root inode in case of all failed mount paths.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 16 Jan 2011 10:05:08 -0800
From:	Manish Katiyar <mkatiyar@...il.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	"Theodore Ts'o" <tytso@....edu>, ext4 <linux-ext4@...r.kernel.org>,
	mkatiyar@...il.com
Subject: Re: [PATCH] ext4: Fix missing iput for root inode in case of all
 failed mount paths.

On Sun, Jan 16, 2011 at 8:20 AM, Andreas Dilger <adilger@...ger.ca> wrote:
> Why not just put the iput() at failed_mount4() instead of spread around the code?

Thanks Andreas, Here is the updated patch.

Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
---
 fs/ext4/super.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index cb10a06..8fa53e9 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3522,17 +3522,16 @@ no_journal:
        if (IS_ERR(root)) {
                ext4_msg(sb, KERN_ERR, "get root inode failed");
                ret = PTR_ERR(root);
+               root = NULL;
                goto failed_mount4;
        }
        if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
-               iput(root);
                ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
                goto failed_mount4;
        }
        sb->s_root = d_alloc_root(root);
        if (!sb->s_root) {
                ext4_msg(sb, KERN_ERR, "get root dentry failed");
-               iput(root);
                ret = -ENOMEM;
                goto failed_mount4;
        }
@@ -3648,6 +3647,8 @@ cantfind_ext4:
        goto failed_mount;

 failed_mount4:
+       iput(root);
+       sb->s_root = NULL;
        ext4_msg(sb, KERN_ERR, "mount failed");
        destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
 failed_mount_wq:
-- 
1.7.1



>
> Cheers, Andreas
>
> On 2011-01-16, at 0:30, Manish Katiyar <mkatiyar@...il.com> wrote:
>
>> Fix missing iput for root inode in case of all failed mount paths.
>> Fixes bug#26752
>>
>> Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
>>
>> ---
>> fs/ext4/super.c |    8 +++++++-
>> 1 files changed, 7 insertions(+), 1 deletions(-)
>>
>> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
>> index cb10a06..9570fcc 100644
>> --- a/fs/ext4/super.c
>> +++ b/fs/ext4/super.c
>> @@ -3587,6 +3587,7 @@ no_journal:
>>        if (err) {
>>                ext4_msg(sb, KERN_ERR, "failed to initialize system "
>>                         "zone (%d)", err);
>> +               iput(root);
>>                goto failed_mount4;
>>        }
>>
>> @@ -3595,12 +3596,15 @@ no_journal:
>>        if (err) {
>>                ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
>>                         err);
>> +               iput(root);
>>                goto failed_mount4;
>>        }
>>
>>        err = ext4_register_li_request(sb, first_not_zeroed);
>> -       if (err)
>> +       if (err) {
>> +               iput(root);
>>                goto failed_mount4;
>> +       }
>>
>>        sbi->s_kobj.kset = ext4_kset;
>>        init_completion(&sbi->s_kobj_unregister);
>> @@ -3609,6 +3613,7 @@ no_journal:
>>        if (err) {
>>                ext4_mb_release(sb);
>>                ext4_ext_release(sb);
>> +               iput(root);
>>                goto failed_mount4;
>>        };
>>
>> @@ -3648,6 +3653,7 @@ cantfind_ext4:
>>        goto failed_mount;
>>
>> failed_mount4:
>> +       sb->s_root = NULL;
>>        ext4_msg(sb, KERN_ERR, "mount failed");
>>        destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
>> failed_mount_wq:
>> --
>> 1.7.1
>>
>>
>> --
>> Thanks -
>> Manish
>> ==================================
>> [$\*.^ -- I miss being one of them
>> ==================================
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
>> the body of a message to majordomo@...r.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>



-- 
Thanks -
Manish
==================================
[$\*.^ -- I miss being one of them
==================================
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html