[jira] [Updated] (ZOOKEEPER-1305) zookeeper.c:prepend_string func can dereference null ptr

["Daniel Lescohier (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Lescohier updated ZOOKEEPER-1305:
----------------------------------------

    Attachment: ZOOKEEPER-1305.patch
    
> zookeeper.c:prepend_string func can dereference null ptr
> --------------------------------------------------------
>
>                 Key: ZOOKEEPER-1305
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1305
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: c client
>    Affects Versions: 3.3.3
>         Environment: All
>            Reporter: Daniel Lescohier
>              Labels: patch
>         Attachments: ZOOKEEPER-1305.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> All the callers of the function prepend_string make a call to prepend_string before checking that zhandle_t *zh is not null. At the top of prepend_string, zh is dereferenced without checking for a null ptr:
> static char* prepend_string(zhandle_t *zh, const char* client_path) {
>     char *ret_str;
>     if (zh->chroot == NULL)
>         return (char *) client_path;
> I propose fixing this by adding the check here in prepend_string:
> static char* prepend_string(zhandle_t *zh, const char* client_path) {
>     char *ret_str;
>     if (zh==NULL || zh->chroot == NULL)
>         return (char *) client_path;

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