[Bugs] [Bug 1625643] New: Use CALLOC in dht_layouts_init

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1625643

            Bug ID: 1625643
           Summary: Use CALLOC in dht_layouts_init
           Product: GlusterFS
           Version: mainline
         Component: distribute
          Assignee: bugs at gluster.org
          Reporter: nbalacha at redhat.com
                CC: bugs at gluster.org



Description of problem:

If dht_layouts_init fails, dht_init cleans it up by calling:

                if (conf->file_layouts) {                                       
                        for (i = 0; i < conf->subvolume_cnt; i++) {             
                                GF_FREE (conf->file_layouts[i]);                
                        }                                                       
                        GF_FREE (conf->file_layouts);                           
                } 

GF_FREE checks and frees non-null values. With malloc, we could end up with
random non-null values in the buffer which GF_FREE will attempt to free.


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