On Mon, 2016-10-10 at 10:15 -0700, Eric Biggers wrote:
> The per-transform 'consts' array is accessed as __be64 in
> crypto_cmac_digest_setkey() but was only guaranteed to be aligned to
> __alignof__(long). Fix this by aligning it to __alignof__(__be64).
[]
> diff --git a/crypto/cmac.c b/crypto/cmac.c
[]
> @@ -57,7 +57,8 @@ static int crypto_cmac_digest_setkey(struct crypto_shash
> *parent,
> unsigned long alignmask = crypto_shash_alignmask(parent);
> struct cmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
> unsigned int bs = crypto_shash_blocksize(parent);
> - __be64 *consts = PTR_ALIGN((void *)ctx->ctx, alignmask + 1);
> + __be64 *consts = PTR_ALIGN((void *)ctx->ctx,
> + (alignmask | (__alignof__(__be64) - 1)) + 1);
Using a bitwise or looks very odd there. Perhaps:
min(alignmask + 1, __alignof__(__be64))
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