linux-kernel - Re: [PATCH] io_uring/rsrc: fix null ptr dereference in io_sqe_buffer

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Message-ID: <1a89b102-19e3-4384-a871-a75bdad32e82@kernel.dk>
Date: Sun, 3 Nov 2024 20:58:02 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Daniel Yang <danielyangkang@...il.com>,
 Pavel Begunkov <asml.silence@...il.com>,
 "open list:IO_URING" <io-uring@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Cc: syzbot+05c0f12a4d43d656817e@...kaller.appspotmail.com
Subject: Re: [PATCH] io_uring/rsrc: fix null ptr dereference in
 io_sqe_buffer_register

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