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io_uring: zero tag on rsrc removal

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[ Upstream commit 8f0a24801b ]

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@gmail.com>
Link: https://lore.kernel.org/r/1cf262a50df17478ea25b22494dcc19f3a80301f.1649336342.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavel Begunkov 2022-04-07 14:05:04 +01:00 committed by Greg Kroah-Hartman
parent efb020924a
commit 5218d5cc02
1 changed files with 3 additions and 1 deletions
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4
fs/io_uring.c
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@ -8413,13 +8413,15 @@ 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;