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io_uring: re-set iov base/len for buffer select retry 

We already have the buffer selected, but we should set the iter list
again.

Cc: stable@vger.kernel.org # v5.7
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-06-04 11:27:01 -06:00
parent d2b6f48b69
commit dddb3e26f6
1 changed files with 7 additions and 1 deletions
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8
fs/io_uring.c
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@ -2363,8 +2363,14 @@ static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov,
static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov,
bool needs_lock)
{
if (req->flags & REQ_F_BUFFER_SELECTED)
if (req->flags & REQ_F_BUFFER_SELECTED) {
struct io_buffer *kbuf;
kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
iov[0].iov_len = kbuf->len;
return 0;
}
if (!req->rw.len)
return 0;
else if (req->rw.len > 1)