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* [PATCH] io_uring: fix free of unallocated buffer list
@ 2022-07-21 11:01 Dylan Yudaken
  2022-07-21 11:03 ` Pavel Begunkov
  2022-07-21 14:29 ` Jens Axboe
  0 siblings, 2 replies; 3+ messages in thread
From: Dylan Yudaken @ 2022-07-21 11:01 UTC (permalink / raw)
  To: Jens Axboe, Pavel Begunkov, io-uring
  Cc: Kernel-team, linux-kernel, Dylan Yudaken, Dipanjan Das

in the error path of io_register_pbuf_ring, only free bl if it was
allocated.

Reported-by: Dipanjan Das <[email protected]>
Fixes: c7fb19428d67 ("io_uring: add support for ring mapped supplied buffers")
Signed-off-by: Dylan Yudaken <[email protected]>
---
 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


^ permalink raw reply related	[flat|nested] 3+ messages in thread

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2022-07-21 11:01 [PATCH] io_uring: fix free of unallocated buffer list Dylan Yudaken
2022-07-21 11:03 ` Pavel Begunkov
2022-07-21 14:29 ` Jens Axboe

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