6.1-stable review patch. If anyone has any objections, please let me know.
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From: Jens Axboe axboe@kernel.dk
commit cf960726eb65e8d0bfecbcce6cf95f47b1ffa6cc 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 --- io_uring/kbuf.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -336,6 +336,8 @@ int io_provide_buffers_prep(struct io_ki 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))