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io_uring: fix removing the wrong file in __io_sqe_files_update()

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Index here is already the position of the file in fixed_file_table, we
should not use io_file_from_index() again to get it. Otherwise, the
wrong file which still in use may be released unexpectedly.

Cc: stable@vger.kernel.org # v5.6
Fixes: 05f3fb3c53 ("io_uring: avoid ring quiesce for fixed file set unregister and update")
Signed-off-by: Jiufei Xue <jiufei.xue@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jiufei Xue 2020-09-01 13:35:02 +08:00 committed by Jens Axboe
parent fdee946d09
commit 98dfd5024a
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -7324,7 +7324,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
if (table->files[index]) {
file = io_file_from_index(ctx, index);
file = table->files[index];
err = io_queue_file_removal(data, file);
if (err)
break;