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

[Wolfgang Walter]

Hello

another maybe stupid question to

commit fafe0fa2995a0f7073c1c358d7d3145bcc9aedd8
Author: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxx>
    Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>


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
Anstalt des öffentlichen Rechts