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authorPavel Begunkov <asml.silence@gmail.com>2021-03-18 11:54:35 +0000
committerJens Axboe <axboe@kernel.dk>2021-03-18 09:44:35 -0600
commitde75a3d3f5a14c9ab3c4883de3471d3c92a8ee78 (patch)
tree825ae49269672936357ee4e265b31db25d6ecf64 /fs/io_uring.c
parentee53fb2b197b72b126ca0387ae636da75d969428 (diff)
downloadlinux-stericsson-de75a3d3f5a14c9ab3c4883de3471d3c92a8ee78.tar.gz
io_uring: don't leak creds on SQO attach error
Attaching to already dead/dying SQPOLL task is disallowed in io_sq_offload_create(), but cleanup is hand coded by calling io_put_sq_data()/etc., that miss to put ctx->sq_creds. Defer everything to error-path io_sq_thread_finish(), adding ctx->sqd_list in the error case as well as finish will handle it. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io_uring.c')
-rw-r--r--fs/io_uring.c17
1 files changed, 6 insertions, 11 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 675073966760..ea2d3e120555 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7910,22 +7910,17 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
ret = 0;
io_sq_thread_park(sqd);
+ list_add(&ctx->sqd_list, &sqd->ctx_list);
+ io_sqd_update_thread_idle(sqd);
/* don't attach to a dying SQPOLL thread, would be racy */
- if (attached && !sqd->thread) {
+ if (attached && !sqd->thread)
ret = -ENXIO;
- } else {
- list_add(&ctx->sqd_list, &sqd->ctx_list);
- io_sqd_update_thread_idle(sqd);
- }
io_sq_thread_unpark(sqd);
- if (ret < 0) {
- io_put_sq_data(sqd);
- ctx->sq_data = NULL;
- return ret;
- } else if (attached) {
+ if (ret < 0)
+ goto err;
+ if (attached)
return 0;
- }
if (p->flags & IORING_SETUP_SQ_AFF) {
int cpu = p->sq_thread_cpu;