[PATCH] io_uring/kbuf: Fix an NULL vs IS_ERR() bug in io_alloc_pbuf_ring()

[Dan Carpenter <dan.carpenter@linaro.org>]

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@linaro.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