linux-kernel - Re: [PATCH] io_uring: Fix memory leak in io_sqe_buffers

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Message-ID: <51a36bba-c6d7-1e31-36d2-899466738e97@kernel.dk>
Date:   Fri, 30 Apr 2021 06:44:39 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     qiang.zhang@...driver.com, io-uring@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring: Fix memory leak in io_sqe_buffers_register()

On 4/30/21 2:25 AM, qiang.zhang@...driver.com wrote:
> From: Zqiang <qiang.zhang@...driver.com>
> 
> unreferenced object 0xffff8881123bf0a0 (size 32):
> comm "syz-executor557", pid 8384, jiffies 4294946143 (age 12.360s)
> backtrace:
> [<ffffffff81469b71>] kmalloc_node include/linux/slab.h:579 [inline]
> [<ffffffff81469b71>] kvmalloc_node+0x61/0xf0 mm/util.c:587
> [<ffffffff815f0b3f>] kvmalloc include/linux/mm.h:795 [inline]
> [<ffffffff815f0b3f>] kvmalloc_array include/linux/mm.h:813 [inline]
> [<ffffffff815f0b3f>] kvcalloc include/linux/mm.h:818 [inline]
> [<ffffffff815f0b3f>] io_rsrc_data_alloc+0x4f/0xc0 fs/io_uring.c:7164
> [<ffffffff815f26d8>] io_sqe_buffers_register+0x98/0x3d0 fs/io_uring.c:8383
> [<ffffffff815f84a7>] __io_uring_register+0xf67/0x18c0 fs/io_uring.c:9986
> [<ffffffff81609222>] __do_sys_io_uring_register fs/io_uring.c:10091 [inline]
> [<ffffffff81609222>] __se_sys_io_uring_register fs/io_uring.c:10071 [inline]
> [<ffffffff81609222>] __x64_sys_io_uring_register+0x112/0x230 fs/io_uring.c:10071
> [<ffffffff842f616a>] do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
> [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> Fix data->tags memory leak, through io_rsrc_data_free() to release
> data memory space.

Applied, thanks.

-- 
Jens Axboe