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io_uring: set table->files[i] to NULL when io_sqe_file_register failed

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While io_sqe_file_register() failed in __io_sqe_files_update(),
table->files[i] still point to the original file which may freed
soon, and that will trigger use-after-free problems.

Cc: stable@vger.kernel.org
Fixes: f3bd9dae37 ("io_uring: fix memleak in __io_sqe_files_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 2020-09-02 17:59:39 +08:00 committed by Jens Axboe
parent 98dfd5024a
commit 95d1c8e5f8
1 changed files with 1 additions and 0 deletions
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fs/io_uring.c
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@ -7353,6 +7353,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
table->files[index] = file;
err = io_sqe_file_register(ctx, file, i);
if (err) {
table->files[index] = NULL;
fput(file);
break;
}