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io_uring/kbuf: reject zero sized provided buffers

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commit cf960726eb upstream.

This isn't fixing a real issue, but there's also zero point in going
through group and buffer setup, when the buffers are going to be
rejected once attempted to get used.

Cc: stable@vger.kernel.org
Reported-by: syzbot+58928048fd1416f1457c@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2025-04-07 07:51:23 -06:00 committed by Greg Kroah-Hartman
parent b7c6d081c1
commit 3e0356857e
1 changed files with 2 additions and 0 deletions
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2
io_uring/kbuf.c
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@ -484,6 +484,8 @@ int io_provide_buffers_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe
p->nbufs = tmp;
p->addr = READ_ONCE(sqe->addr);
p->len = READ_ONCE(sqe->len);
if (!p->len)
return -EINVAL;
if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs,
&size))