[PATCH 4.19 051/271] RAS/CEC: Fix pfn insertion

[PATCH 4.19 051/271] RAS/CEC: Fix pfn insertion

[Greg Kroah-Hartman]

[ Upstream commit 6d8e294bf5f0e85c34e8b14b064e2965f53f38b0 ]

When inserting random PFNs for debugging the CEC through
(debugfs)/ras/cec/pfn, depending on the return value of pfn_set(),
multiple values get inserted per a single write.

That is because simple_attr_write() interprets a retval of 0 as
success and claims the whole input. However, pfn_set() returns the
cec_add_elem() value, which, if > 0 and smaller than the whole input
length, makes glibc continue issuing the write syscall until there's
input left:

  pfn_set
  simple_attr_write
  debugfs_attr_write
  full_proxy_write
  vfs_write
  ksys_write
  do_syscall_64
  entry_SYSCALL_64_after_hwframe

leading to those repeated calls.

Return 0 to fix that.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ras/cec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index f85d6b7a1984..5d2b2c02cbbe 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -369,7 +369,9 @@ static int pfn_set(void *data, u64 val)
 {
 	*(u64 *)data = val;
 
-	return cec_add_elem(val);
+	cec_add_elem(val);
+
+	return 0;
 }
 
 DEFINE_DEBUGFS_ATTRIBUTE(pfn_ops, u64_get, pfn_set, "0x%llx\n");
-- 
2.20.1

[PATCH 4.19 086/271] EDAC/sysfs: Fix memory leak when creating a csrow object

[Greg Kroah-Hartman]

[ Upstream commit 585fb3d93d32dbe89e718b85009f9c322cc554cd ]

In edac_create_csrow_object(), the reference to the object is not
released when adding the device to the device hierarchy fails
(device_add()). This may result in a memory leak.

Signed-off-by: Pan Bian <bianpan2016@163.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: https://lkml.kernel.org/r/1555554438-103953-1-git-send-email-bianpan2016@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/edac/edac_mc_sysfs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 20374b8248f0..e50610b5bd06 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -404,6 +404,8 @@ static inline int nr_pages_per_csrow(struct csrow_info *csrow)
 static int edac_create_csrow_object(struct mem_ctl_info *mci,
 				    struct csrow_info *csrow, int index)
 {
+	int err;
+
 	csrow->dev.type = &csrow_attr_type;
 	csrow->dev.bus = mci->bus;
 	csrow->dev.groups = csrow_dev_groups;
@@ -416,7 +418,11 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
 	edac_dbg(0, "creating (virtual) csrow node %s\n",
 		 dev_name(&csrow->dev));
 
-	return device_add(&csrow->dev);
+	err = device_add(&csrow->dev);
+	if (err)
+		put_device(&csrow->dev);
+
+	return err;
 }
 
 /* Create a CSROW object under specifed edac_mc_device */
-- 
2.20.1