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Fri, 14 Nov 2025 08:15:33 -0800 (PST) Message-ID: <1a2445d1-6fbb-4133-b5b7-72254e96d815@gmail.com> Date: Fri, 14 Nov 2025 18:15:16 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] fs/super: fix memory leak of s_fs_info on setup_bdev_super failure To: Christian Brauner Cc: syzbot+ad45f827c88778ff7df6@syzkaller.appspotmail.com, frank.li@vivo.com, glaubitz@physik.fu-berlin.de, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, slava@dubeyko.com, syzkaller-bugs@googlegroups.com References: <69155e34.050a0220.3565dc.0019.GAE@google.com> <20251114051215.526577-1-mehdi.benhadjkhelifa@gmail.com> <20251114-raubt-benoten-bf2d8f2317b2@brauner> Content-Language: en-US From: Mehdi Ben Hadj Khelifa In-Reply-To: <20251114-raubt-benoten-bf2d8f2317b2@brauner> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/14/25 12:55 PM, Christian Brauner wrote: > On Fri, Nov 14, 2025 at 06:12:12AM +0100, Mehdi Ben Hadj Khelifa wrote: >> #syz test >> >> diff --git a/fs/super.c b/fs/super.c >> index 5bab94fb7e03..a99e5281b057 100644 >> --- a/fs/super.c >> +++ b/fs/super.c >> @@ -1690,6 +1690,11 @@ int get_tree_bdev_flags(struct fs_context *fc, >> if (!error) >> error = fill_super(s, fc); >> if (error) { >> + /* >> + * return back sb_info ownership to fc to be freed by put_fs_context() >> + */ >> + fc->s_fs_info = s->s_fs_info; >> + s->s_fs_info = NULL; >> deactivate_locked_super(s); >> return error; >> } >> -- >> 2.51.2 >> > > No, either free it in hfs_fill_super() when it fails or add a wrapper > around kill_block_super() for hfs and free it after ->kill_sb() has run. Sorry for the noise,Resending with proper CCs: I forgot to mention. I was giving back the ownership to the filesystem context because upon setup_bdev_super fails put_fs_context still gets called even if I would free s_fs_info in the kill_sb,so hfs_free_fc would get a NULL pointer to kfree as a result..I don't think that would be desirable. I would be sending my patch out for more discussion. Best Regards, Mehdi Ben Hadj Khelifa