On 01/11/2018 05:50 AM, Martin Kletzander wrote:
> On Tue, Jan 02, 2018 at 06:12:01PM +0100, Michal Privoznik wrote:
>> In the future, completer callbacks will receive partially parsed
>> command (and thus possibly incomplete). However, we still want
>> them to use command options fetching APIs we already have (e.g.
>> vshCommandOpt*()) and at the same time don't report any errors
>> (nor call any asserts).
>>
>> Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
>> ---
>> tools/vsh.c | 7 ++++---
>> tools/vsh.h | 3 ++-
>> 2 files changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/tools/vsh.c b/tools/vsh.c
>> index ebc8d9cb1..d27acb95b 100644
>> --- a/tools/vsh.c
>> +++ b/tools/vsh.c
>> @@ -815,8 +815,8 @@ vshCommandFree(vshCmd *cmd)
>> * to the option if found, 0 with *OPT set to NULL if the name is
>> * valid and the option is not required, -1 with *OPT set to NULL if
>> * the option is required but not present, and assert if NAME is not
>> - * valid (which indicates a programming error). No error messages are
>> - * issued if a value is returned.
>> + * valid (which indicates a programming error) unless cmd->skipChecks
>> + * is set. No error messages are issued if a value is returned.
>> */
>> static int
>> vshCommandOpt(const vshCmd *cmd, const char *name, vshCmdOpt **opt,
>> @@ -829,7 +829,8 @@ vshCommandOpt(const vshCmd *cmd, const char *name,
>> vshCmdOpt **opt,
>> /* See if option is valid and/or required. */
>> *opt = NULL;
>> while (valid) {
>> - assert(valid->name);
>> + if (!cmd->skipChecks)
>> + assert(valid->name);
>
> This can segfault when cmd->skipChecks == False && valid->name == NULL,
> which is what the assert() guarded before.
>
> So either STREQ_NULLABLE or another if.
>
Hmmm... Also see:
https://www.redhat.com/archives/libvir-list/2017-December/msg00605.html
it's related somewhat...
John
>> if (STREQ(name, valid->name))
>> break;
>> valid++;
>> diff --git a/tools/vsh.h b/tools/vsh.h
>> index 8f7df9ff8..112b1b57d 100644
>> --- a/tools/vsh.h
>> +++ b/tools/vsh.h
>> @@ -188,7 +188,8 @@ struct _vshCmdDef {
>> struct _vshCmd {
>> const vshCmdDef *def; /* command definition */
>> vshCmdOpt *opts; /* list of command arguments */
>> - vshCmd *next; /* next command */
>> + vshCmd *next; /* next command */
>> + bool skipChecks; /* skip validity checks when
>> retrieving opts */
>> };
>>
>> /*
>> --
>> 2.13.6
>>
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>
>
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