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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>
This commit is contained in:
Pavel Begunkov 2021-03-18 11:54:35 +00:00 committed by Jens Axboe
parent ee53fb2b19
commit de75a3d3f5
1 changed files with 6 additions and 11 deletions
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17
fs/io_uring.c
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@ -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;