This is a note to let you know that I've just added the patch titled
io_uring/kbuf: Fix an NULL vs IS_ERR() bug in io_alloc_pbuf_ring()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-kbuf-fix-an-null-vs-is_err-bug-in-io_alloc_.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2d39d07ccd2bc8d76207a57b0e4faaa479aa77c6
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Tue Dec 5 15:37:17 2023 +0300
io_uring/kbuf: Fix an NULL vs IS_ERR() bug in io_alloc_pbuf_ring()
[ Upstream commit e53f7b54b1fdecae897f25002ff0cff04faab228 ]
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/5ed268d3-a997-4f64-bd71-47faa92101ab@moroto.mountain
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c
index 012f622036049..12eec4778c5b1 100644
--- a/io_uring/kbuf.c
+++ b/io_uring/kbuf.c
@@ -623,8 +623,8 @@ 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);
