Commit 60303631 authored by Liang He's avatar Liang He Committed by Jens Axboe

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

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: 43fdf274 ("[SPARC64]: Abstract out mdesc accesses for better MD update handling.")
Signed-off-by: default avatarLiang He <windhl@126.com>
Link: https://lore.kernel.org/r/20230315062032.1741692-1-windhl@126.com
[axboe: style cleanup]
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent b6402014
...@@ -972,6 +972,8 @@ static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id) ...@@ -972,6 +972,8 @@ static int vdc_port_probe(struct vio_dev *vdev, const struct vio_device_id *id)
print_version(); print_version();
hp = mdesc_grab(); hp = mdesc_grab();
if (!hp)
return -ENODEV;
err = -ENODEV; err = -ENODEV;
if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) { if ((vdev->dev_no << PARTITION_SHIFT) & ~(u64)MINORMASK) {
......
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