diff options
| author | Liang He <windhl@126.com> | 2023-03-15 14:20:32 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-22 13:31:27 +0100 |
| commit | d1bfd4cf6bb8b1c0da00ab25ad6cdb85121cbbbf (patch) | |
| tree | 13e67372c8c2aa7b9d0514d0479d3db6f923e183 /drivers/block/sunvdc.c | |
| parent | f1d5888a5efe345b63c430b256e95acb0a475642 (diff) | |
block: sunvdc: add check for mdesc_grab() returning NULL
[ Upstream commit 6030363199e3a6341afb467ddddbed56640cbf6a ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/block/sunvdc.c')
| -rw-r--r-- | drivers/block/sunvdc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c index 4d4bb810c2ae..656d99faf40a 100644 --- a/drivers/block/sunvdc.c +++ b/drivers/block/sunvdc.c @@ -964,6 +964,8 @@ 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) { |