Re: [PATCH] drm/i915/bios: Move a variable assignment behind a null pointer check in intel_bios_encoder_supports_dp_dual_mode()
Markus Elfring <[email protected]> Tue, 14 Jul 2026 18:10:08 +0200
| Newsgroups | gmane.linux.kernel.janitors,gmane.comp.freedesktop.xorg.drivers.intel,gmane.comp.video.dri.devel,gmane.linux.kernel |
|---|---|
| Message-ID | <[email protected]> |
>>> The address of a data structure member was determined before
>>> a corresponding null pointer check in the implementation of
>>> the function “intel_bios_encoder_supports_dp_dual_mode”.
>>>
>>> Thus avoid the risk for undefined behaviour by reducing the scope for
>>> the variable “child” behind condition checks.
>>>
>>> This issue was detected by using the Coccinelle software.
>>>
>>> Fixes: 044cbc7a74c136f12a80c855cadd1b085084aef1 ("drm/i915/bios: Nuke DEVICE_TYPE_DP_DUAL_MODE_BITS")
>>> Cc: [email protected]
>
> Please stop adding Fixes tags to these and talking about "undefined
> behavior" in the commit message. Pointer math is defined...
What does hinder you to take additional information sources better into account?
> It's just a style preference on your part.
Do you find the guidance appropriate according to the SEI CERT C Coding Standard?
https://cmu-sei.github.io/secure-coding-standards/sei-cert-c-coding-standard/rules/expressions-exp/exp34-c/
Regards,
Markus