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io_uring-5.19-2022-07-21 

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Merge tag 'io_uring-5.19-2022-07-21' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
 "Fix for a bad kfree() introduced in this cycle, and a quick fix for
  disabling buffer recycling for IORING_OP_READV.

  The latter will get reworked for 5.20, but it gets the job done for
  5.19"

* tag 'io_uring-5.19-2022-07-21' of git://git.kernel.dk/linux-block:
  io_uring: do not recycle buffer in READV
  io_uring: fix free of unallocated buffer list
This commit is contained in:
Linus Torvalds 2022-07-22 12:47:09 -07:00
parent d945404f74 934447a603
commit a5235996e1
1 changed files with 11 additions and 3 deletions
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14
fs/io_uring.c
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@ -1737,6 +1737,14 @@ static void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags)
(req->flags & REQ_F_PARTIAL_IO))
return;
/*
* READV uses fields in `struct io_rw` (len/addr) to stash the selected
* buffer data. However if that buffer is recycled the original request
* data stored in addr is lost. Therefore forbid recycling for now.
*/
if (req->opcode == IORING_OP_READV)
return;
/*
* We don't need to recycle for REQ_F_BUFFER_RING, we can just clear
* the flag and hence ensure that bl->head doesn't get incremented.
@ -12931,7 +12939,7 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
{
struct io_uring_buf_ring *br;
struct io_uring_buf_reg reg;
struct io_buffer_list *bl;
struct io_buffer_list *bl, *free_bl = NULL;
struct page **pages;
int nr_pages;
@ -12963,7 +12971,7 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
if (bl->buf_nr_pages || !list_empty(&bl->buf_list))
return -EEXIST;
} else {
bl = kzalloc(sizeof(*bl), GFP_KERNEL);
free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL);
if (!bl)
return -ENOMEM;
}
@ -12972,7 +12980,7 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
struct_size(br, bufs, reg.ring_entries),
&nr_pages);
if (IS_ERR(pages)) {
kfree(bl);
kfree(free_bl);
return PTR_ERR(pages);
}