[PATCH 5.13 125/127] io_uring: fix xa_alloc_cycle() error return value check

Sasha Levin
2021-08-24T17:04:44Z

From: Jens Axboe <axboe@kernel.dk>

[ 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 <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/io_uring.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 221b80ae831f..9df82eee440a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9835,10 +9835,11 @@ static int io_register_personality(struct io_ring_ctx *ctx)

ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)creds,
XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL);
- if (!ret)
- return id;
- put_cred(creds);
- return ret;
+ if (ret < 0) {
+ put_cred(creds);
+ return ret;
+ }
+ return id;
}

static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,
--
2.30.2