From: Damien Le Moal damien.lemoal@wdc.com
stable inclusion from linux-4.19.207 commit 0dfadcf9e9e4dc072fd328ea34fe1830993b425b
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[ Upstream commit 355a8031dc174450ccad2a61c513ad7222d87a97 ]
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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/ata/libata-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 51558a5ff30e4..7e0577279f933 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -6441,7 +6441,7 @@ 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) {