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zloop: check that the zone backing file support ->{read,write}_iter

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I/O to backing files requires support for iter based read/write, so check
for that upfront instead of dereferencing a NULL pointer later.

Fixes: eb0570c7df ("block: new zoned loop block device driver")
Reported-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20261029150353.2503201-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2026-10-29 16:03:35 +01:00 committed by Jens Axboe
parent 134ffb0755
commit 0c10f8a1a7
1 changed files with 5 additions and 0 deletions
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5
drivers/block/zloop.c
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@ -1132,6 +1132,11 @@ static int zloop_init_zone(struct zloop_device *zlo, struct zloop_options *opts,
return PTR_ERR(zone->file);
}
if (!zone->file->f_op->read_iter || !zone->file->f_op->write_iter) {
ret = -EINVAL;
goto out_fput;
}
if (zlo->block_size) {
ret = zloop_get_block_size(zlo, zone);
if (ret)