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authorDan Williams <dan.j.williams@intel.com>2016-10-29 00:34:51 +0300
committerDan Williams <dan.j.williams@intel.com>2016-10-29 00:35:25 +0300
commit6a84fb4b4e439a8ef0ce19ec7e7661ad76f655c9 (patch)
tree20ca54f7eb6c1bc09cab3e33090181d81ae142ee /drivers/dax/pmem.c
parented99d3673e082b78b20208f346d2cd375483a779 (diff)
downloadlinux-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/pmem.c')
-rw-r--r--drivers/dax/pmem.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
index 4a15fa5df98b..73c6ce93a0d9 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);