Re: [PATCH 02/11] virtio_console: Less function calls in init_vqs() after error detection
From: Amit Shah <hidden>
Date: 2016-09-21 12:10:42
Also in:
lkml, virtualization
From: Amit Shah <hidden>
Date: 2016-09-21 12:10:42
Also in:
lkml, virtualization
Hi, On (Wed) 14 Sep 2016 [16:01:28], SF Markus Elfring wrote:
From: Markus Elfring <redacted> Date: Wed, 14 Sep 2016 14:00:35 +0200 The kfree() function was called in up to five cases by the init_vqs() function during error handling even if the passed variable contained a null pointer. * Return directly after a call of the function "kmalloc_array" failed at the beginning. * Split a condition check for memory allocation failures so that each pointer from these function calls will be checked immediately. See also background information: Topic "CWE-754: Improper check for unusual or exceptional conditions" Link: https://cwe.mitre.org/data/definitions/754.html * Adjust jump targets according to the Linux coding style convention.
So I've seen this series and I'm not yet sure how I feel about the patches - f.e. in this one, it adds more lines than it removes to achieve the same effect. I think the code is currently more readable than after these changes. And even if kfree is called multiple times, it isn't a huge bother -- it's error case anyway, very unlikely to trigger, but keeps everything very readble. Amit