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io_uring: fix io_req_prep_async with provided buffers

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io_req_prep_async() can import provided buffers, commit the ring state
by giving up on that before, it'll be reimported later if needed.

Reported-by: Muhammad Ramdhan <ramdhan@starlabs.sg>
Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Reported-by: Jacob Soo <jacob.soo@starlabs.sg>
Fixes: c7fb19428d67d ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2025-02-10 17:27:55 +00:00 committed by Greg Kroah-Hartman
parent 233b210a67
commit a1b17713b3
1 changed files with 4 additions and 1 deletions
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5
io_uring/io_uring.c
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@ -1624,6 +1624,7 @@ bool io_alloc_async_data(struct io_kiocb *req)
int io_req_prep_async(struct io_kiocb *req) int io_req_prep_async(struct io_kiocb *req)
{ {
const struct io_op_def *def = &io_op_defs[req->opcode]; const struct io_op_def *def = &io_op_defs[req->opcode];
int ret;
/* assign early for deferred execution for non-fixed file */ /* assign early for deferred execution for non-fixed file */
if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE) && !req->file) if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE) && !req->file)
@ -1636,7 +1637,9 @@ int io_req_prep_async(struct io_kiocb *req)
if (io_alloc_async_data(req)) if (io_alloc_async_data(req))
return -EAGAIN; return -EAGAIN;
} }
return def->prep_async(req); ret = def->prep_async(req);
io_kbuf_recycle(req, 0);
return ret;
} }
static u32 io_get_sequence(struct io_kiocb *req) static u32 io_get_sequence(struct io_kiocb *req)