hulk inclusion category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/9817 CVE: CVE-2026-46033 -------------------------------- The commit 51c8d538230b ("crypto: authencesn - reject short ahash digests during instance creation") added a digestsize check in crypto_authenc_esn_create() but used "goto err_free_inst" as the error path, skipping "err_drop_auth". On 4.19/4.18 the error labels are structured as a progressive cleanup chain (err_drop_enc -> err_drop_auth -> err_free_inst), where each label only cleans up one resource and falls through to the next. Skipping err_drop_auth means crypto_drop_ahash() is not called, so the ahash spawn remains linked on the underlying algorithm's cra_users list after kfree(inst) frees the memory containing it. This creates a dangling list node that triggers a use-after-free when cra_users is later traversed (e.g. algorithm unregistration via CRYPTO_MSG_DELALG or rmmod). On 5.10+ the err_free_inst label calls crypto_authenc_esn_free() which performs full cleanup (drop_skcipher + drop_ahash + kfree), so the original goto is safe there. The backport did not account for the different label structure on 4.19/4.18. Fix this by changing the goto target from err_free_inst to err_drop_auth, which properly removes the ahash spawn via crypto_drop_ahash() before falling through to kfree(inst). Fixes: 567af76238c38 ("crypto: authencesn - reject short ahash digests during instance creation") Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com> --- crypto/authencesn.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/authencesn.c b/crypto/authencesn.c index 318fc75d326b2..cbff969428243 100644 --- a/crypto/authencesn.c +++ b/crypto/authencesn.c @@ -429,7 +429,7 @@ static int crypto_authenc_esn_create(struct crypto_template *tmpl, crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); if (auth->digestsize > 0 && auth->digestsize < 4) { err = -EINVAL; - goto err_free_inst; + goto err_drop_auth; } err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, -- 2.43.0