From: Dylan Yudaken <dylany@fb.com>
To: Jens Axboe <axboe@kernel.dk>,
Pavel Begunkov <asml.silence@gmail.com>,
<io-uring@vger.kernel.org>
Cc: <Kernel-team@fb.com>, <linux-kernel@vger.kernel.org>,
Dylan Yudaken <dylany@fb.com>,
Dipanjan Das <mail.dipanjan.das@gmail.com>
Subject: [PATCH] io_uring: fix free of unallocated buffer list
Date: Thu, 21 Jul 2022 04:01:15 -0700 [thread overview]
Message-ID: <20220721110115.3964104-1-dylany@fb.com> (raw)
in the error path of io_register_pbuf_ring, only free bl if it was
allocated.
Reported-by: Dipanjan Das <mail.dipanjan.das@gmail.com>
Fixes: c7fb19428d67 ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
---
fs/io_uring.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index a01ea49f3017..2b7bb62c7805 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -12931,7 +12931,7 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
{
struct io_uring_buf_ring *br;
struct io_uring_buf_reg reg;
- struct io_buffer_list *bl;
+ struct io_buffer_list *bl, *free_bl = NULL;
struct page **pages;
int nr_pages;
@@ -12963,7 +12963,7 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
if (bl->buf_nr_pages || !list_empty(&bl->buf_list))
return -EEXIST;
} else {
- bl = kzalloc(sizeof(*bl), GFP_KERNEL);
+ free_bl = bl = kzalloc(sizeof(*bl), GFP_KERNEL);
if (!bl)
return -ENOMEM;
}
@@ -12972,7 +12972,7 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
struct_size(br, bufs, reg.ring_entries),
&nr_pages);
if (IS_ERR(pages)) {
- kfree(bl);
+ kfree(free_bl);
return PTR_ERR(pages);
}
base-commit: ff6992735ade75aae3e35d16b17da1008d753d28
--
2.30.2
next reply other threads:[~2022-07-21 11:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 11:01 Dylan Yudaken [this message]
2022-07-21 11:03 ` [PATCH] io_uring: fix free of unallocated buffer list Pavel Begunkov
2022-07-21 14:29 ` Jens Axboe
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