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authorPavel Begunkov <asml.silence@gmail.com>2020-02-19 00:19:09 +0300
committerJens Axboe <axboe@kernel.dk>2020-02-19 03:12:23 +0300
commit929a3af90f0f4bd7132d83552c1a98c83f60ef7e (patch)
tree0d485e68f97162440e341abbafc3aa268b7fcd0b /fs
parent297a31e3e8318f533cff4fe33ffaefb74f72c6e2 (diff)
downloadlinux-929a3af90f0f4bd7132d83552c1a98c83f60ef7e.tar.xz
io_uring: fix use-after-free by io_cleanup_req()
io_cleanup_req() should be called before req->io is freed, and so shouldn't be after __io_free_req() -> __io_req_aux_free(). Also, it will be ignored for in io_free_req_many(), which use __io_req_aux_free(). Place cleanup_req() into __io_req_aux_free(). Fixes: 99bc4c38537d774 ("io_uring: fix iovec leaks") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs')
-rw-r--r--fs/io_uring.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index d35b45696c73..6e249aa97ba3 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1260,6 +1260,9 @@ static void __io_req_aux_free(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
+ if (req->flags & REQ_F_NEED_CLEANUP)
+ io_cleanup_req(req);
+
kfree(req->io);
if (req->file) {
if (req->flags & REQ_F_FIXED_FILE)
@@ -1275,9 +1278,6 @@ static void __io_free_req(struct io_kiocb *req)
{
__io_req_aux_free(req);
- if (req->flags & REQ_F_NEED_CLEANUP)
- io_cleanup_req(req);
-
if (req->flags & REQ_F_INFLIGHT) {
struct io_ring_ctx *ctx = req->ctx;
unsigned long flags;