linux-kernel - Re: [PATCH] Null check to prevent null-ptr-deref bug

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Message-ID: <2023052852-footwork-sanding-e450@gregkh>
Date:   Sun, 28 May 2023 18:52:11 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Prince Kumar Maurya <princekumarmaurya06@...il.com>
Cc:     skhan@...uxfoundation.org, viro@...iv.linux.org.uk,
        brauner@...nel.org, chenzhongjin@...wei.com,
        syzkaller-bugs@...glegroups.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Null check to prevent null-ptr-deref bug

On Sun, May 28, 2023 at 10:35:46AM -0700, Prince Kumar Maurya wrote:
> sb_getblk(inode->i_sb, parent) return a null ptr and taking lock on
> that leads to the null-ptr-deref bug.
> 
> Signed-off-by: Prince Kumar Maurya <princekumarmaurya06@...il.com>
> ---
> Change since v1: update the commit message.
> The bug was reproducible using the reproducer code and assets found in
> bug report:https://syzkaller.appspot.com/bug?extid=aad58150cbc64ba41bdc

Also, did you forget to properly credit the syzbot tool like it asks you
to?