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| author | Dan Williams <dan.j.williams@intel.com> | 2018-04-07 02:37:21 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2018-04-07 08:59:39 +0300 |
| commit | 4f8672201b7e7ed4f5f6c3cf6dcd080648580582 (patch) | |
| tree | 6b9902aa2775c4e3811fe4ba71800d9b01ab9771 /drivers/nvdimm/namespace_devs.c | |
| parent | c31898c8c711f2bbbcaebe802a55827e288d875a (diff) | |
| download | linux-4f8672201b7e7ed4f5f6c3cf6dcd080648580582.tar.xz | |
libnvdimm, namespace: use a safe lookup for dimm device name
The following NULL dereference results from incorrectly assuming that
ndd is valid in this print:
struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]);
/*
* Give up if we don't find an instance of a uuid at each
* position (from 0 to nd_region->ndr_mappings - 1), or if we
* find a dimm with two instances of the same uuid.
*/
dev_err(&nd_region->dev, "%s missing label for %pUb\n",
dev_name(ndd->dev), nd_label->uuid);
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
IP: nd_region_register_namespaces+0xd67/0x13c0 [libnvdimm]
PGD 0 P4D 0
Oops: 0000 [#1] SMP PTI
CPU: 43 PID: 673 Comm: kworker/u609:10 Not tainted 4.16.0-rc4+ #1
[..]
RIP: 0010:nd_region_register_namespaces+0xd67/0x13c0 [libnvdimm]
[..]
Call Trace:
? devres_add+0x2f/0x40
? devm_kmalloc+0x52/0x60
? nd_region_activate+0x9c/0x320 [libnvdimm]
nd_region_probe+0x94/0x260 [libnvdimm]
? kernfs_add_one+0xe4/0x130
nvdimm_bus_probe+0x63/0x100 [libnvdimm]
Switch to using the nvdimm device directly.
Fixes: 0e3b0d123c8f ("libnvdimm, namespace: allow multiple pmem...")
Cc: <stable@vger.kernel.org>
Reported-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/nvdimm/namespace_devs.c')
| -rw-r--r-- | drivers/nvdimm/namespace_devs.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 89b40ff83025..28afdd668905 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -1921,7 +1921,7 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region, } if (i < nd_region->ndr_mappings) { - struct nvdimm_drvdata *ndd = to_ndd(&nd_region->mapping[i]); + struct nvdimm *nvdimm = nd_region->mapping[i].nvdimm; /* * Give up if we don't find an instance of a uuid at each @@ -1929,7 +1929,7 @@ static struct device *create_namespace_pmem(struct nd_region *nd_region, * find a dimm with two instances of the same uuid. */ dev_err(&nd_region->dev, "%s missing label for %pUb\n", - dev_name(ndd->dev), nd_label->uuid); + nvdimm_name(nvdimm), nd_label->uuid); rc = -EINVAL; goto err; } |