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Thu, 25 Dec 2025 06:58:11 -0800 (PST) Message-ID: <564afab7-a894-4da8-9980-7d68a0a1babc@kernel.dk> Date: Thu, 25 Dec 2025 07:58:09 -0700 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 v2] io_uring: fix filename leak in __io_openat_prep() To: Prithvi Tambewagh Cc: io-uring@vger.kernel.org, brauner@kernel.org, jack@suse.cz, viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linux.dev, skhan@linuxfoundation.org, david.hunter.linux@gmail.com, khalid@kernel.org, syzbot+00e61c43eb5e4740438f@syzkaller.appspotmail.com, stable@vger.kernel.org References: <20251225072829.44646-1-activprithvi@gmail.com> Content-Language: en-US From: Jens Axboe In-Reply-To: <20251225072829.44646-1-activprithvi@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 12/25/25 12:28 AM, Prithvi Tambewagh wrote: > __io_openat_prep() allocates a struct filename using getname(). However, > for the condition of the file being installed in the fixed file table as > well as having O_CLOEXEC flag set, the function returns early. At that > point, the request doesn't have REQ_F_NEED_CLEANUP flag set. Due to this, > the memory for the newly allocated struct filename is not cleaned up, > causing a memory leak. > > Fix this by setting the REQ_F_NEED_CLEANUP for the request just after the > successful getname() call, so that when the request is torn down, the > filename will be cleaned up, along with other resources needing cleanup. > > Reported-by: syzbot+00e61c43eb5e4740438f@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=00e61c43eb5e4740438f > Tested-by: syzbot+00e61c43eb5e4740438f@syzkaller.appspotmail.com > Cc: stable@vger.kernel.org > Signed-off-by: Prithvi Tambewagh Thanks, just missing a: Fixes: b9445598d8c6 ("io_uring: openat directly into fixed fd table") which I'll add when applying. -- Jens Axboe