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AJvYcCUbuEZWfREgNqrY4aQRIlqBOI3RsYo5MPsn7d1sjo5hXI0aqErkSPzNFVyL6dUzB0PQiquuUqmFiQ==@vger.kernel.org X-Gm-Message-State: AOJu0Ywf1ZmLnqAwAq2ZRjxShLOgQA2vYz4eOc5BjCVAdTv/G8Qd6dmy 5Mmsvt3HUsXdi1n2FQaa6pU8YXQItqZ2WY4z3kryMuy8yqZYWGq3c45FYcEioQ8= X-Google-Smtp-Source: AGHT+IHSzlEn4SnUyAwromaWjOCJLe72lJZnCD+/VbW83o1zZNEuNWD2zS2KN2CM0oZvxNE5X2tJxA== X-Received: by 2002:a17:90b:4a8c:b0:2e2:acd7:1df0 with SMTP id 98e67ed59e1d1-2e92cf85afamr18367601a91.41.1730692684736; Sun, 03 Nov 2024 19:58:04 -0800 (PST) Received: from [192.168.1.150] ([198.8.77.157]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e93db183cdsm6479729a91.40.2024.11.03.19.58.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 03 Nov 2024 19:58:04 -0800 (PST) Message-ID: <1a89b102-19e3-4384-a871-a75bdad32e82@kernel.dk> Date: Sun, 3 Nov 2024 20:58:02 -0700 Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] io_uring/rsrc: fix null ptr dereference in io_sqe_buffer_register To: Daniel Yang , Pavel Begunkov , "open list:IO_URING" , open list Cc: syzbot+05c0f12a4d43d656817e@syzkaller.appspotmail.com References: <20241104035105.192960-1-danielyangkang@gmail.com> Content-Language: en-US From: Jens Axboe In-Reply-To: <20241104035105.192960-1-danielyangkang@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/3/24 8:51 PM, Daniel Yang wrote: > The call stack io_sqe_buffer_register -> io_buffer_account_pin -> > headpage_already_acct results in a null ptr dereference in the for loop. > There is no guarantee that ctx->buf_table.nodes[i] is an allocated node > so add a check if null before dereferencing. Assuming this is an older tree, it's fixed in the current tree. -- Jens Axboe