6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
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@xxxxxxxxxxx>
Reported-by: Bing-Jhong Billy Jheng <billy@xxxxxxxxxxx>
Reported-by: Jacob Soo <jacob.soo@xxxxxxxxxxx>
Fixes: c7fb19428d67d ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/io_uring.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1779,6 +1779,7 @@ int io_req_prep_async(struct io_kiocb *r
{
const struct io_cold_def *cdef = &io_cold_defs[req->opcode];
const struct io_issue_def *def = &io_issue_defs[req->opcode];
+ int ret;
/* assign early for deferred execution for non-fixed file */
if (def->needs_file && !(req->flags & REQ_F_FIXED_FILE) && !req->file)
@@ -1791,7 +1792,9 @@ int io_req_prep_async(struct io_kiocb *r
if (io_alloc_async_data(req))
return -EAGAIN;
}
- return cdef->prep_async(req);
+ ret = cdef->prep_async(req);
+ io_kbuf_recycle(req, 0);
+ return ret;
}
static u32 io_get_sequence(struct io_kiocb *req)
