linux-kernel - [PATCH] io_uring/kbuf: Fix an NULL vs IS_ERR() bug in io_alloc_pbuf

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Message-ID: <5ed268d3-a997-4f64-bd71-47faa92101ab@moroto.mountain>
Date:   Tue, 5 Dec 2023 15:37:17 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] io_uring/kbuf: Fix an NULL vs IS_ERR() bug in
 io_alloc_pbuf_ring()

The io_mem_alloc() function returns error pointers, not NULL.  Update
the check accordingly.

Fixes: b10b73c102a2 ("io_uring/kbuf: recycle freed mapped buffer ring entries")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 io_uring/kbuf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 268788305b61..bd25bc2deeaf 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -636,8 +636,8 @@ static int io_alloc_pbuf_ring(struct io_ring_ctx *ctx,
 	ibf = io_lookup_buf_free_entry(ctx, ring_size);
 	if (!ibf) {
 		ptr = io_mem_alloc(ring_size);
-		if (!ptr)
-			return -ENOMEM;
+		if (IS_ERR(ptr))
+			return PTR_ERR(ptr);
 
 		/* Allocate and store deferred free entry */
 		ibf = kmalloc(sizeof(*ibf), GFP_KERNEL_ACCOUNT);
-- 
2.42.0