linux-kernel - Re: [PATCH] crypto: acomp - Fix CFI failure due to type punning

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Message-ID: <aHosBA15RgslSFui@gondor.apana.org.au>
Date: Fri, 18 Jul 2025 21:12:04 +1000
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Eric Biggers <ebiggers@...nel.org>
Cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	suman.kumar.chakraborty@...el.com, ebiggers@...nel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] crypto: acomp - Fix CFI failure due to type punning

Eric Biggers <ebiggers@...nel.org> wrote:
> To avoid a crash when control flow integrity is enabled, make the
> workspace ("stream") free function use a consistent type, and call it
> through a function pointer that has that same type.
> 
> Fixes: 42d9f6c77479 ("crypto: acomp - Move scomp stream allocation code into acomp")
> Cc: stable@...r.kernel.org
> Signed-off-by: Eric Biggers <ebiggers@...nel.org>
> ---
> crypto/deflate.c                    | 7 ++++++-
> crypto/zstd.c                       | 7 ++++++-
> include/crypto/internal/acompress.h | 5 +----
> 3 files changed, 13 insertions(+), 6 deletions(-)

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