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libata: fix ata_host_start()

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[ Upstream commit 355a8031dc ]

The loop on entry of ata_host_start() may not initialize host->ops to a
non NULL value. The test on the host_stop field of host->ops must then
be preceded by a check that host->ops is not NULL.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210816014456.2191776-3-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Damien Le Moal 2021-08-16 10:44:47 +09:00 committed by Greg Kroah-Hartman
parent 93a562afc9
commit eabc00ee99
1 changed files with 1 additions and 1 deletions
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2
drivers/ata/libata-core.c
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@ -6339,7 +6339,7 @@ int ata_host_start(struct ata_host *host)
have_stop = 1;
}
if (host->ops->host_stop)
if (host->ops && host->ops->host_stop)
have_stop = 1;
if (have_stop) {