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block: sunvdc: add check for mdesc_grab() returning NULL

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In vdc_port_probe(), we should check the return value of mdesc_grab() as
it may return NULL, which can cause potential NPD bug.

Fixes: 43fdf27470b2 ("[SPARC64]: Abstract out mdesc accesses for better MD update handling.")
Signed-off-by: Liang He <windhl@126.com>
Link: https://lore.kernel.org/r/20230315062032.1741692-1-windhl@126.com
[axboe: style cleanup]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Liang He 2023-03-15 14:20:32 +08:00 committed by Jens Axboe
parent b6402014ca
commit 6030363199
1 changed files with 2 additions and 0 deletions
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drivers/block/sunvdc.c
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@ -972,6 +972,8 @@ static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
print_version();
hp = mdesc_grab();
if (!hp)
return -ENODEV;
err = -ENODEV;
if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {