From: Jens Axboe axboe@kernel.dk
[ 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 axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- 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; }