linux-kernel - Re: [PATCH] hwrng: fix division by zero in ks_sa_rng

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Message-ID: <aNiyVogNAXQ3AtuT@gondor.apana.org.au>
Date: Sun, 28 Sep 2025 11:58:14 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Nishanth Menon <nm@...com>
Cc: Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Olivia Mackall <olivia@...enic.com>,
	Alexander Sverdlin <alexander.sverdlin@...ia.com>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH] hwrng: fix division by zero in ks_sa_rng_init

On Fri, Sep 19, 2025 at 08:20:02AM -0500, Nishanth Menon wrote:
> Fix division by zero in ks_sa_rng_init caused by missing clock
> pointer initialization. The clk_get_rate() call is performed on
> an uninitialized clk pointer, resulting in division by zero when
> calculating delay values.
> 
> Add clock initialization code before using the clock.
> 
> Fixes: 6d01d8511dce ("hwrng: ks-sa - Add minimum sleep time before ready-polling")
> Signed-off-by: Nishanth Menon <nm@...com>
> 
>  drivers/char/hw_random/ks-sa-rng.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> ---
> 
> Noticed this when looking at kci logs:
> https://dashboard.kernelci.org/log-viewer?itemId=ti%3A0af42187f4b24261b0c102f0&org=ti&type=test&url=http%3A%2F%2Ffiles.kernelci.org%2F%2Fti%2Fmainline%2Fmaster%2Fv6.17-rc6-43-g8b789f2b7602%2Farm%2Fmulti_v7_defconfig%2BCONFIG_EFI%3Dy%2BCONFIG_ARM_LPAE%3Dy%2Bdebug%2Bkselftest%2Btinyconfig%2Fgcc-12%2Fbaseline-nfs-boot.nfs-k2hk-evm.txt.gz
> 
> Fixed version boot:
> https://gist.github.com/nmenon/0996e5f7bdbcd3b014cee9921a60d88c
> 
>  drivers/char/hw_random/ks-sa-rng.c | 4 ++++
>  1 file changed, 4 insertions(+)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt