From 695ab28a7fa107d0350ab19eba8ec89fac45a95d Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 24 Aug 2021 13:15:01 +0100 Subject: [PATCH] io_uring: fix xa_alloc_cycle() error return value check [ upstream commit a30f895ad3239f45012e860d4f94c1a388b36d14 ] We currently check for ret != 0 to indicate error, but '1' is a valid return and just indicates that the allocation succeeded with a wrap. Correct the check to be for < 0, like it was before the xarray conversion. Cc: stable@vger.kernel.org Fixes: 61cf93700fe6 ("io_uring: Convert personality_idr to XArray") Signed-off-by: Jens Axboe Signed-off-by: Pavel Begunkov Signed-off-by: Sasha Levin --- fs/io_uring.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index ed641dca79573..762eae2440b5e 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -9601,11 +9601,12 @@ static int io_register_personality(struct io_ring_ctx *ctx) ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)iod, XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL); - if (!ret) - return id; - put_cred(iod->creds); - kfree(iod); - return ret; + if (ret < 0) { + put_cred(iod->creds); + kfree(iod); + return ret; + } + return id; } static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,