gfapi: Duplicate the buffer sent in setxattr calls

Issue:
The caller of glfs_setxattr sends a buffer to set as the value.
We create a dict in which the pointer to the value is set.
Underlying layers like md-cache take a ref on this dict to store
the value for a longer time. But the moment setxattr is complete,
the caller of glfs_setxattr can free the value memory.

Solution:
memcpy the setxattr value to the gluster buffer.

> Reviewed-on: https://review.gluster.org/17967
> Reviewed-by: soumya k <skoduri@redhat.com>
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> Reviewed-by: Jeff Darcy <jeff@pl.atyp.us>
> (cherry picked from commit e11296f8e52b7e3b13d21b41d4fa34baea878edf)

Change-Id: I58753fe702e8b7d0f6c4f058714c65d0ad5d7a0a
BUG: 1479655
Signed-off-by: Poornima G <pgurusid@redhat.com>
Reviewed-on: https://review.gluster.org/18001
Smoke: Gluster Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shyamsundar Ranganathan <srangana@redhat.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/api/src/glfs-handleops.c b/api/src/glfs-handleops.c
index dbffa9e26bf..4180f5cf777 100644
--- a/api/src/glfs-handleops.c
+++ b/api/src/glfs-handleops.c
@@ -481,6 +481,7 @@ pub_glfs_h_setxattrs (struct glfs *fs, struct glfs_object *object,
         inode_t         *inode = NULL;
         loc_t            loc = {0, };
         dict_t          *xattr = NULL;
+        void            *value_cp = NULL;
 
         /* validate in args */
         if ((fs == NULL) || (object == NULL) ||
@@ -517,8 +518,13 @@ pub_glfs_h_setxattrs (struct glfs *fs, struct glfs_object *object,
                 goto out;
         }
 
-        xattr = dict_for_key_value (name, value, size);
+        value_cp = gf_memdup (value, size);
+        GF_CHECK_ALLOC_AND_LOG (subvol->name, value_cp, ret, "Failed to"
+                                " duplicate setxattr value", out);
+
+        xattr = dict_for_key_value (name, value_cp, size, _gf_false);
         if (!xattr) {
+                GF_FREE (value_cp);
                 ret = -1;
                 errno = ENOMEM;
                 goto out;