6.18.22: a question to commit "crypto: algif_aead - Revert to operating out-of-place"

[Wolfgang Walter <linux@stwm.de>]

Hello

another maybe stupid question to

commit fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
Author: Herbert Xu <herbert@gondor.apana.org.au>
Date:   Thu Mar 26 15:30:20 2026 +0900

     crypto: algif_aead - Revert to operating out-of-place

     [ Upstream commit a664bf3d603dc3bdcf9ae47cc21e0daec706d7a5 ]

     This mostly reverts commit 72548b093ee3 except for the copying of
     the associated data.

     There is no benefit in operating in-place in algif_aead since the
     source and destination come from different mappings.  Get rid of
     all the complexity added for in-place operation and just copy the
     AD directly.

     Fixes: 72548b093ee3 ("crypto: algif_aead - copy AAD from src to 
dst")
     Reported-by: Taeyang Lee <0wn@theori.io>
     Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
     Signed-off-by: Sasha Levin <sashal@kernel.org>


This commit makes

crypto/algif_aead.c

almost like the version in v7.0, but there is a difference:

$ git diff v6.18.22..v7.0 crypto/algif_aead.c
diff --git a/crypto/algif_aead.c b/crypto/algif_aead.c
index dda15bb05e89..f8bd45f7dc83 100644
--- a/crypto/algif_aead.c
+++ b/crypto/algif_aead.c
@@ -144,7 +144,7 @@ static int _aead_recvmsg(struct socket *sock, struct 
msghdr *msg,
         if (usedpages < outlen) {
                 size_t less = outlen - usedpages;

-               if (used < less) {
+               if (used < less + (ctx->enc ? 0 : as)) {
                         err = -EINVAL;
                         goto free;
                 }


Is this intentional? Or is der missing a fix from v7.0 in 6.18.22

Regards
-- 
Wolfgang Walter
Studierendenwerk München Oberbayern
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