[PATCH 5.10.y 1/3] net: ipv4: stop checking crypto_ahash_alignmask

[Sasha Levin <sashal@kernel.org>]

From: Eric Biggers <ebiggers@google.com>

[ Upstream commit e77f5dd701381cef35b9ea8b6dea6e62c8a7f9f3 ]

Now that the alignmask for ahash and shash algorithms is always 0,
crypto_ahash_alignmask() always returns 0 and will be removed.  In
preparation for this, stop checking crypto_ahash_alignmask() in ah4.c.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Stable-dep-of: ec54093e6a8f ("xfrm: ah: account for ESN high bits in async callbacks")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/ipv4/ah4.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 36ed85bf2ad51..9641fa578bf86 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -27,9 +27,7 @@ static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
 {
 	unsigned int len;
 
-	len = size + crypto_ahash_digestsize(ahash) +
-	      (crypto_ahash_alignmask(ahash) &
-	       ~(crypto_tfm_ctx_alignment() - 1));
+	len = size + crypto_ahash_digestsize(ahash);
 
 	len = ALIGN(len, crypto_tfm_ctx_alignment());
 
@@ -46,10 +44,9 @@ static inline u8 *ah_tmp_auth(void *tmp, unsigned int offset)
 	return tmp + offset;
 }
 
-static inline u8 *ah_tmp_icv(struct crypto_ahash *ahash, void *tmp,
-			     unsigned int offset)
+static inline u8 *ah_tmp_icv(void *tmp, unsigned int offset)
 {
-	return PTR_ALIGN((u8 *)tmp + offset, crypto_ahash_alignmask(ahash) + 1);
+	return tmp + offset;
 }
 
 static inline struct ahash_request *ah_tmp_req(struct crypto_ahash *ahash,
@@ -129,7 +126,7 @@ static void ah_output_done(struct crypto_async_request *base, int err)
 	int ihl = ip_hdrlen(skb);
 
 	iph = AH_SKB_CB(skb)->tmp;
-	icv = ah_tmp_icv(ahp->ahash, iph, ihl);
+	icv = ah_tmp_icv(iph, ihl);
 	memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
 
 	top_iph->tos = iph->tos;
@@ -182,7 +179,7 @@ static int ah_output(struct xfrm_state *x, struct sk_buff *skb)
 	if (!iph)
 		goto out;
 	seqhi = (__be32 *)((char *)iph + ihl);
-	icv = ah_tmp_icv(ahash, seqhi, seqhi_len);
+	icv = ah_tmp_icv(seqhi, seqhi_len);
 	req = ah_tmp_req(ahash, icv);
 	sg = ah_req_sg(ahash, req);
 	seqhisg = sg + nfrags;
@@ -279,7 +276,7 @@ static void ah_input_done(struct crypto_async_request *base, int err)
 
 	work_iph = AH_SKB_CB(skb)->tmp;
 	auth_data = ah_tmp_auth(work_iph, ihl);
-	icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);
+	icv = ah_tmp_icv(auth_data, ahp->icv_trunc_len);
 
 	err = crypto_memneq(icv, auth_data, ahp->icv_trunc_len) ? -EBADMSG : 0;
 	if (err)
@@ -374,7 +371,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
 
 	seqhi = (__be32 *)((char *)work_iph + ihl);
 	auth_data = ah_tmp_auth(seqhi, seqhi_len);
-	icv = ah_tmp_icv(ahash, auth_data, ahp->icv_trunc_len);
+	icv = ah_tmp_icv(auth_data, ahp->icv_trunc_len);
 	req = ah_tmp_req(ahash, icv);
 	sg = ah_req_sg(ahash, req);
 	seqhisg = sg + nfrags;
-- 
2.53.0