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Re: Problem report #13 FALSE
From: |
Andreas Schwab |
Subject: |
Re: Problem report #13 FALSE |
Date: |
Thu, 11 May 2006 11:30:34 +0200 |
User-agent: |
Gnus/5.110006 (No Gnus v0.6) Emacs/22.0.50 (gnu/linux) |
Kenichi Handa <address@hidden> writes:
> Dan Nicolaescu <address@hidden> writes:
>
>> CID: 13
>> Checker: FORWARD_NULL (help)
>> File: emacs/src/coding.c
>> Function: encode_coding_string
>> Description: Variable "(coding)->cmp_data" tracked as NULL was passed to a
>> function that dereferences it.
>
> I see no bug here. A member of (coding)->cmp_data is
> accessed only after checking (coding)->cmp_data is not NULL.
>
>> Event var_compare_op: Added "(coding)->cmp_data" due to comparison
>> "(coding)->cmp_data == 0"
>> Also see events: [var_deref_model]
>> At conditional (1): "(coding)->cmp_data == 0" taking true path
>
>> 6435 if (coding->type != coding_type_ccl
>> 6436 && (! coding->cmp_data || coding->cmp_data->used == 0))
>> 6437 {
>
> Does the checker require it to be writen as below?
>
>> 6436 && (coding->cmp_data ? coding->cmp_data->used == 0 : 1))
That would be stupid, since it would be a major obfucation. But that's
not the point of the report, the derefence is supposed to happen in
encode_coding.
Andreas.
--
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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