linux-kernel - Re: [PATCH 8/9] ALSA: aoa: avoid false-positive format truncation warning

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Message-ID: <87il1880fv.wl-tiwai@suse.de>
Date: Wed, 27 Mar 2024 10:54:12 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Arnd Bergmann <arnd@...nel.org>
Cc: llvm@...ts.linux.dev,
	Johannes Berg <johannes@...solutions.net>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Dawei Li <set_pte_at@...look.com>,
	linuxppc-dev@...ts.ozlabs.org,
	alsa-devel@...a-project.org,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] ALSA: aoa: avoid false-positive format truncation warning

On Tue, 26 Mar 2024 23:38:07 +0100,
Arnd Bergmann wrote:
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang warns about what it interprets as a truncated snprintf:
> 
> sound/aoa/soundbus/i2sbus/core.c:171:6: error: 'snprintf' will always be truncated; specified size is 6, but format string expands to at least 7 [-Werror,-Wformat-truncation-non-kprintf]
> 
> The actual problem here is that it does not understand the special
> %pOFn format string and assumes that it is a pointer followed by
> the string "OFn", which would indeed not fit.
> 
> Slightly increasing the size of the buffer to its natural alignment
> avoids the warning, as it is now long enough for the correct and
> the incorrect interprations.
> 
> Fixes: b917d58dcfaa ("ALSA: aoa: Convert to using %pOFn instead of device_node.name")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied this one now to sound.git tree.  Thanks.


Takashi