EDAC: Don't allow empty DIMM labels
Updating dimm_label to an empty string does not make much sense. Change
the sysfs dimm_label store operation to fail a request when an input
string is empty.
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: elliott@hpe.com
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1443124767.25474.172.camel@hpe.com
Signed-off-by: Borislav Petkov <bp@suse.de>
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index bf6b680..3929391 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -248,7 +248,7 @@
if (data[count - 1] == '\0' || data[count - 1] == '\n')
copy_count -= 1;
- if (copy_count >= sizeof(rank->dimm->label))
+ if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label))
return -EINVAL;
strncpy(rank->dimm->label, data, copy_count);
@@ -509,7 +509,7 @@
if (data[count - 1] == '\0' || data[count - 1] == '\n')
copy_count -= 1;
- if (copy_count >= sizeof(dimm->label))
+ if (copy_count == 0 || copy_count >= sizeof(dimm->label))
return -EINVAL;
strncpy(dimm->label, data, copy_count);