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io_uring: validate the full range of provided buffers for access

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Account for the number of provided buffers when validating the address
range.

Signed-off-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Bijan Mottahedeh 2020-06-04 18:01:52 -07:00 committed by Jens Axboe
parent dddb3e26f6
commit efe68c1ca8
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -3183,7 +3183,7 @@ static int io_provide_buffers_prep(struct io_kiocb *req,
p->addr = READ_ONCE(sqe->addr);
p->len = READ_ONCE(sqe->len);
if (!access_ok(u64_to_user_ptr(p->addr), p->len))
if (!access_ok(u64_to_user_ptr(p->addr), (p->len * p->nbufs)))
return -EFAULT;
p->bgid = READ_ONCE(sqe->buf_group);