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io_uring: check that data field is 0 in ringfd unregister

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Only allow data field to be 0 in struct io_uring_rsrc_update user
arguments to allow for future possible usage.

Fixes: e7a6c00dc7 ("io_uring: add support for registering ring file descriptors")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Link: https://lore.kernel.org/r/20220429142218.GA28696@asgard.redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Eugene Syromiatnikov 2022-04-29 16:22:18 +02:00 committed by Jens Axboe
parent 32452a3eb8
commit 303cc749c8
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -10593,7 +10593,7 @@ static int io_ringfd_unregister(struct io_ring_ctx *ctx, void __user *__arg,
ret = -EFAULT;
break;
}
if (reg.resv || reg.offset >= IO_RINGFD_REG_MAX) {
if (reg.resv || reg.data || reg.offset >= IO_RINGFD_REG_MAX) {
ret = -EINVAL;
break;
}