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| author | Dan Williams <dan.j.williams@intel.com> | 2016-10-28 21:34:51 (GMT) |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-10-28 21:35:25 (GMT) |
| commit | 6a84fb4b4e439a8ef0ce19ec7e7661ad76f655c9 (patch) | |
| tree | 20ca54f7eb6c1bc09cab3e33090181d81ae142ee /drivers/dax | |
| parent | ed99d3673e082b78b20208f346d2cd375483a779 (diff) | |
| download | linux-6a84fb4b4e439a8ef0ce19ec7e7661ad76f655c9.tar.xz | |
device-dax: check devm_nsio_enable() return value
If the dax_pmem driver is passed a resource that is already busy the
driver probe attempt should fail with a message like the following:
dax_pmem dax0.1: could not reserve region [mem 0x100000000-0x11fffffff]
However, if we do not catch the error we crash for the obvious reason of
accessing memory that is not mapped.
BUG: unable to handle kernel paging request at ffffc90020001000
IP: [<ffffffff81496712>] __memcpy+0x12/0x20
[..]
Call Trace:
[<ffffffff815c4960>] ? nsio_rw_bytes+0x60/0x180
[<ffffffff815c6045>] nd_pfn_validate+0x75/0x320
[<ffffffff815c63a9>] nvdimm_setup_pfn+0xb9/0x5d0
[<ffffffff815c48ef>] ? devm_nsio_enable+0xff/0x110
[<ffffffff815cb699>] dax_pmem_probe+0x59/0x260
Cc: <stable@vger.kernel.org>
Fixes: ab68f2622136 ("/dev/dax, pmem: direct access to persistent memory")
Reported-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
| -rw-r--r-- | drivers/dax/pmem.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c index 4a15fa5..73c6ce9 100644 --- a/drivers/dax/pmem.c +++ b/drivers/dax/pmem.c @@ -78,7 +78,9 @@ static int dax_pmem_probe(struct device *dev) nsio = to_nd_namespace_io(&ndns->dev); /* parse the 'pfn' info block via ->rw_bytes */ - devm_nsio_enable(dev, nsio); + rc = devm_nsio_enable(dev, nsio); + if (rc) + return rc; altmap = nvdimm_setup_pfn(nd_pfn, &res, &__altmap); if (IS_ERR(altmap)) return PTR_ERR(altmap); |