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Date: Mon, 11 Apr 2022 20:44:04 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Pavel Begunkov <asml.silence@...il.com>, Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>, io-uring@...r.kernel.org Subject: [PATCH AUTOSEL 5.17 46/49] io_uring: zero tag on rsrc removal From: Pavel Begunkov <asml.silence@...il.com> [ Upstream commit 8f0a24801bb44aa58496945aabb904c729176772 ] Automatically default rsrc tag in io_queue_rsrc_removal(), it's safer than leaving it there and relying on the rest of the code to behave and not use it. Signed-off-by: Pavel Begunkov <asml.silence@...il.com> Link: https://lore.kernel.org/r/1cf262a50df17478ea25b22494dcc19f3a80301f.1649336342.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@...nel.dk> Signed-off-by: Sasha Levin <sashal@...nel.org> --- fs/io_uring.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 5e6788ab188f..d203bbb7b965 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -8529,13 +8529,15 @@ static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file, static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx, struct io_rsrc_node *node, void *rsrc) { + u64 *tag_slot = io_get_tag_slot(data, idx); struct io_rsrc_put *prsrc; prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL); if (!prsrc) return -ENOMEM; - prsrc->tag = *io_get_tag_slot(data, idx); + prsrc->tag = *tag_slot; + *tag_slot = 0; prsrc->rsrc = rsrc; list_add(&prsrc->list, &node->rsrc_list); return 0; -- 2.35.1
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