diff options
| author | Günther Deschner <gd@samba.org> | 2017-10-09 18:02:25 +0200 |
|---|---|---|
| committer | jiffin tony Thottan <jthottan@redhat.com> | 2017-11-09 09:07:06 +0000 |
| commit | 535d677beabd4d6e06437c386ae80e41ae34f122 (patch) | |
| tree | c9f7f8bbe42fd45b1b85e6e11562b7bd88a3e777 /xlators | |
| parent | 3654ddc269a366d786cdef2a799a8b95025f1c8a (diff) | |
md-cache: avoid checking the xattr value buffer with string functions.
xattrs may very well contain binary, non-text data with leading 0
values. Using strcmp for checking empty values is not the appropriate
thing to do: In the best case, it might treat a binary xattr value
starting with 0 from being cached (and hence also from being reported
back with xattr). In the worst case, we might read beyond the end
of a data blob that does contain any zero byte.
We fix this by checking the length of the data blob and checking
the first byte against 0 if the length is one.
> Signed-off-by: Guenther Deschner <gd@samba.org>
> Pair-Programmed-With: Michael Adam <obnox@samba.org>
> Change-Id: If723c465a630b8a37b6be58782a2724df7ac6b11
> BUG: 1476324
> Reviewed-on: https://review.gluster.org/17910
> Reviewed-by: Michael Adam <obnox@samba.org>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Poornima G <pgurusid@redhat.com>
> Tested-by: Poornima G <pgurusid@redhat.com>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> (cherry picked from commit ab4ffdac9dec1867f2d9b33242179cf2b347319d)
Change-Id: If723c465a630b8a37b6be58782a2724df7ac6b11
BUG: 1499892
Signed-off-by: Günther Deschner <gd@samba.org>
Diffstat (limited to 'xlators')
| -rw-r--r-- | xlators/performance/md-cache/src/md-cache.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/xlators/performance/md-cache/src/md-cache.c b/xlators/performance/md-cache/src/md-cache.c index 71fcabab271..364210232cb 100644 --- a/xlators/performance/md-cache/src/md-cache.c +++ b/xlators/performance/md-cache/src/md-cache.c @@ -633,7 +633,7 @@ updatefn(dict_t *dict, char *key, data_t *value, void *data) * not update their cache if the value of a xattr is a 0 byte * data (i.e. ""). */ - if (!strcmp (value->data, "")) + if (value->len == 1 && value->data[0] == '\0') continue; if (dict_set(u->dict, key, value) < 0) { |