linux-kernel - FAILED: Patch "io_uring: fix xa_alloc_cycle() error return value check" failed to apply to 5.10-stable tree

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Date:   Mon, 23 Aug 2021 22:57:52 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, axboe@...nel.dk
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: FAILED: Patch "io_uring: fix xa_alloc_cycle() error return value check" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@...r.kernel.org>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

>From a30f895ad3239f45012e860d4f94c1a388b36d14 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@...nel.dk>
Date: Fri, 20 Aug 2021 14:53:59 -0600
Subject: [PATCH] io_uring: fix xa_alloc_cycle() error return value check

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@...r.kernel.org
Fixes: 61cf93700fe6 ("io_uring: Convert personality_idr to XArray")
Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 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 979941bcd15a..a2e20a6fbfed 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9843,10 +9843,11 @@ 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