linux-kernel - Re: [PATCH] crypto: af_alg/hash: Fix uninit-value access in af_alg_free

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Date: Wed, 27 Dec 2023 13:03:42 +0900 (JST)
From: Shigeru Yoshida <syoshida@...hat.com>
To: herbert@...dor.apana.org.au
Cc: davem@...emloft.net, dhowells@...hat.com, linux-crypto@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: af_alg/hash: Fix uninit-value access in
 af_alg_free_sg()

On Fri, 22 Dec 2023 11:42:43 +0800, Herbert Xu wrote:
> On Mon, Dec 11, 2023 at 10:59:49PM +0900, Shigeru Yoshida wrote:
>>
>> Fixes: c662b043cdca ("crypto: af_alg/hash: Support MSG_SPLICE_PAGES")
> 
> I think it should actually be
> 
> 	b6d972f6898308fbe7e693bf8d44ebfdb1cd2dc4
> 	crypto: af_alg/hash: Fix recvmsg() after sendmsg(MSG_MORE)
> 
> Anyway, I think we should fix it by adding a new goto label that
> does not free the SG list:
> 
> unlock_free:
> 	af_alg_free_sg(&ctx->sgl);
> <--- Add new label here
> 	hash_free_result(sk, ctx);
> 	ctx->more = false;
> 	goto unlock;

Thanks for the feedback, and sorry for the late response.

I'll check the code again, and send v2 patch.

Thanks,
Shigeru

> 
> 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
>