tls: rx: react to strparser initialization errors

Tested: selftests
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2143700

commit 849f16b
Author: Jakub Kicinski <[email protected]>
Date:   Mon Aug 15 17:23:58 2022 -0700

    tls: rx: react to strparser initialization errors

    Even though the normal strparser's init function has a return
    value we got away with ignoring errors until now, as it only
    validates the parameters and we were passing correct parameters.

    tls_strp can fail to init on memory allocation errors, which
    syzbot duly induced and reported.

    Reported-by: [email protected]
    Fixes: 84c61fe ("tls: rx: do not use the standard strparser")
    Signed-off-by: Jakub Kicinski <[email protected]>
    Signed-off-by: David S. Miller <[email protected]>

Signed-off-by: Sabrina Dubroca <[email protected]>

Author: Sabrina Dubroca

net/tls/tls_sw.c

@@ -2707,7 +2707,9 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 			crypto_info->version != TLS_1_3_VERSION &&
 			!!(tfm->__crt_alg->cra_flags & CRYPTO_ALG_ASYNC);
 
-		tls_strp_init(&sw_ctx_rx->strp, sk);
+		rc = tls_strp_init(&sw_ctx_rx->strp, sk);
+		if (rc)
+			goto free_aead;
 	}
 
 	goto out;