linux-hardening - Re: [PATCH v4] iio: sx9324: avoid copying property strings

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Date: Tue, 19 Dec 2023 15:27:46 -0800
From: Stephen Boyd <swboyd@...omium.org>
To: Jonathan Cameron <jic23@...nel.org>, Justin Stitt <justinstitt@...gle.com>, 
	Lars-Peter Clausen <lars@...afoo.de>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v4] iio: sx9324: avoid copying property strings

Quoting Justin Stitt (2023-12-19 13:34:15)
> We're doing some needless string copies when trying to assign the proper
> `prop` string. We can make `prop` a const char* and simply assign to
> string literals.
>
> For the case where a format string is used, let's extract the parsing
> logic out into sx9324_parse_phase_prop(). We no longer need to create
> copies or allocate new memory.
>
> sx9324_parse_phase_prop() will simply return the default def value if it
> fails.
>
> This also cleans up some deprecated strncpy() uses [1].
>
> Furthermore, let's clean up this code further by removing some unused
> defines:
> |  #define SX9324_PIN_DEF "semtech,ph0-pin"
> |  #define SX9324_RESOLUTION_DEF "semtech,ph01-resolution"
> |  #define SX9324_PROXRAW_DEF "semtech,ph01-proxraw-strength"
>
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>