linux-kernel - Re: [Linux-kernel-mentees] [PATCH v2] fs: cramfs_fs.h: Fix shifting signed 32-bit value by 31 bits problem

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Message-ID: <20190618160847.GC27611@kroah.com>
Date:   Tue, 18 Jun 2019 18:08:47 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Puranjay Mohan <puranjay12@...il.com>
Cc:     Shuah Khan <skhan@...uxfoundation.org>, hch@...radead.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH v2] fs: cramfs_fs.h: Fix shifting
 signed 32-bit value by 31 bits problem

On Tue, Jun 18, 2019 at 05:19:47PM +0530, Puranjay Mohan wrote:
> Fix CRAMFS_BLK_FLAG_UNCOMPRESSED to use "U" cast to avoid shifting signed
> 32-bit value by 31 bits problem. This isn't a problem for kernel builds
> with gcc.
> 
> This could be problem since this header is part of public API which
> could be included for builds using compilers that don't handle this
> condition safely resulting in undefined behavior.
> 
> Signed-off-by: Puranjay Mohan <puranjay12@...il.com>

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

You should resend this and cc: Nicolas Pitre <nico@...xnic.net> as he is
the cramfs maintainer.

thanks,

greg k-h