git: 72821668b039 - main - stand/kmem_zalloc: panic when a M_WAITOK allocation fails

[Shawn Webb]

On Fri, Jul 09, 2021 at 05:26:57PM +0000, Warner Losh wrote:
> The branch main has been updated by imp:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=72821668b039c276914569e9caa1cdfa4e4cb674
> 
> commit 72821668b039c276914569e9caa1cdfa4e4cb674
> Author:     Warner Losh <imp at FreeBSD.org>
> AuthorDate: 2021-07-09 17:21:18 +0000
> Commit:     Warner Losh <imp at FreeBSD.org>
> CommitDate: 2021-07-09 17:21:18 +0000
> 
>     stand/kmem_zalloc: panic when a M_WAITOK allocation fails
>     
>     Malloc() might return NULL, in which case we will panic with a NULL
>     pointer deref. Make it panic when the allocation fails to preserve the
>     postcondtion that we never return a non-NULL value.

malloc(9) tells us that M_WAITOK will never fail. I'm thinking this
conditional might need to be negated for the !M_WAITOK case, in which
malloc(9) could indeed fail.

Although, even as I type this email, I just realized that a different
function, Malloc, is being called. What's the difference between
malloc and Malloc?

Thanks,

-- 
Shawn Webb
Cofounder / Security Engineer
HardenedBSD

https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc
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