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

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[ 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@linaro.org>
Link: https://lore.kernel.org/r/5ed268d3-a997-4f64-bd71-47faa92101ab@moroto.mountain
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dan Carpenter 2023-12-05 15:37:17 +03:00 • committed by Greg Kroah-Hartman
parent fe145559a9
commit b2173a8b64
1 changed files with 2 additions and 2 deletions
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4
io_uring/kbuf.c
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@ -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);