From 1768acaa6d8a0a0ef6b6ac3d3c0467e4ab404840 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 20 Nov 2019 09:26:29 -0700 Subject: [PATCH] io_uring: io_allocate_scq_urings() should return a sane state [ Upstream commit eb065d301e8c83643367bdb0898becc364046bda ] We currently rely on the ring destroy on cleaning things up in case of failure, but io_allocate_scq_urings() can leave things half initialized if only parts of it fails. Be nice and return with either everything setup in success, or return an error with things nicely cleaned up. Reported-by: syzbot+0d818c0d39399188f393@syzkaller.appspotmail.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- fs/io_uring.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index a340147387ec..74e786578c77 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -3773,12 +3773,18 @@ static int io_allocate_scq_urings(struct io_ring_ctx *ctx, ctx->cq_entries = rings->cq_ring_entries; size = array_size(sizeof(struct io_uring_sqe), p->sq_entries); - if (size == SIZE_MAX) + if (size == SIZE_MAX) { + io_mem_free(ctx->rings); + ctx->rings = NULL; return -EOVERFLOW; + } ctx->sq_sqes = io_mem_alloc(size); - if (!ctx->sq_sqes) + if (!ctx->sq_sqes) { + io_mem_free(ctx->rings); + ctx->rings = NULL; return -ENOMEM; + } return 0; }