On Thu, 2015-09-24 at 21:15 +0200, Borislav Petkov wrote:
> On Thu, Sep 24, 2015 at 01:06:04PM -0600, Toshi Kani wrote:
> > edac-utils(1) checks empty labels and shows them as "ch%d" [1]. So,
> > I think empty labels are supported today, and using 'echo "" >' seems
> > to be a legitimate way to set them empty if desired.
>
> What would be a sane use case to set a DIMM label to an empty string?
Well, I guess there isn't a sane use case for it... :-)
Attached is a patch (on top of patch 2/2) to disallow an empty string.
I prefer to make it as a separate patch in case someone comes up with
a valid use-case for it.
Thanks,
-Toshi
====
Subject: [PATCH] EDAC: Fail empty string to sysfs dimm_label store
Updating dimm_label to an empty string does not make much sense.
Change the sysfs dimm_label store option to fail a request when
an input string is empty.
Suggested-by: Borislav Petkov <b...@alien8.de>
Signed-off-by: Toshi Kani <toshi.k...@hpe.com>
---
drivers/edac/edac_mc_sysfs.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 5252fb9..72ba530 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -248,7 +248,7 @@ static ssize_t channel_dimm_label_store(struct device *dev,
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 @@ static ssize_t dimmdev_label_store(struct device *dev,
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);
--
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