openssl: patch to fix devcrypto sessions leak

Applies a patch from https://github.com/openssl/openssl/pull/8213
that fixes an error where open /dev/crypto sessions were not closed.
Thanks to Ansuel Smith for reporting it.

Signed-off-by: Eneas U de Queiroz <[email protected]>

package/libs/openssl/patches/300-eng_devcrypto-close-open-session-on-init.patch

@@ -0,0 +1,115 @@
+From 82b269fd77d20aa86d0825d798f3045dfe0a7a86 Mon Sep 17 00:00:00 2001
+From: Eneas U de Queiroz <[email protected]>
+Date: Tue, 12 Feb 2019 10:44:19 -0200
+Subject: [PATCH] eng_devcrypto: close open session on init
+
+cipher_init may be called on an already initialized context, without a
+necessary cleanup.  This separates cleanup from initialization, closing
+an eventual open session before creating a new one.
+
+Move the /dev/crypto session cleanup code to its own function.
+
+Signed-off-by: Eneas U de Queiroz <[email protected]>
+
+--- a/crypto/engine/eng_devcrypto.c
++++ b/crypto/engine/eng_devcrypto.c
+@@ -35,6 +35,15 @@
+  */
+ static int cfd;
+ 
++static int clean_devcrypto_session(struct session_op *sess) {
++    if (ioctl(cfd, CIOCFSESSION, &sess->ses) < 0) {
++        SYSerr(SYS_F_IOCTL, errno);
++        return 0;
++    }
++    memset(sess, 0, sizeof(struct session_op));
++    return 1;
++}
++
+ /******************************************************************************
+  *
+  * Ciphers
+@@ -143,7 +152,11 @@ static int cipher_init(EVP_CIPHER_CTX *c
+     const struct cipher_data_st *cipher_d =
+         get_cipher_data(EVP_CIPHER_CTX_nid(ctx));
+ 
+-    memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
++    /* cleanup a previous session */
++    if (cipher_ctx->sess.ses != 0 &&
++        clean_devcrypto_session(&cipher_ctx->sess) == 0)
++        return 0;
++
+     cipher_ctx->sess.cipher = cipher_d->devcryptoid;
+     cipher_ctx->sess.keylen = cipher_d->keylen;
+     cipher_ctx->sess.key = (void *)key;
+@@ -282,15 +295,29 @@ static int ctr_do_cipher(EVP_CIPHER_CTX
+ 
+ static int cipher_ctrl(EVP_CIPHER_CTX *ctx, int type, int p1, void* p2)
+ {
++    struct cipher_ctx *cipher_ctx =
++        (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+     EVP_CIPHER_CTX *to_ctx = (EVP_CIPHER_CTX *)p2;
+-    struct cipher_ctx *cipher_ctx;
++    struct cipher_ctx *to_cipher_ctx;
++
++    switch (type) {
+ 
+-    if (type == EVP_CTRL_COPY) {
++    case EVP_CTRL_COPY:
++        if (cipher_ctx == NULL)
++            return 1;
+         /* when copying the context, a new session needs to be initialized */
+-        cipher_ctx = (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+-        return (cipher_ctx == NULL)
+-            || cipher_init(to_ctx, cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx),
++        to_cipher_ctx =
++            (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(to_ctx);
++        memset(&to_cipher_ctx->sess, 0, sizeof(to_cipher_ctx->sess));
++        return cipher_init(to_ctx, cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx),
+                            (cipher_ctx->op == COP_ENCRYPT));
++
++    case EVP_CTRL_INIT:
++        memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
++        return 1;
++
++    default:
++        break;
+     }
+ 
+     return -1;
+@@ -301,12 +328,7 @@ static int cipher_cleanup(EVP_CIPHER_CTX
+     struct cipher_ctx *cipher_ctx =
+         (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
+ 
+-    if (ioctl(cfd, CIOCFSESSION, &cipher_ctx->sess.ses) < 0) {
+-        SYSerr(SYS_F_IOCTL, errno);
+-        return 0;
+-    }
+-
+-    return 1;
++    return clean_devcrypto_session(&cipher_ctx->sess);
+ }
+ 
+ /*
+@@ -352,6 +374,7 @@ static void prepare_cipher_methods(void)
+             || !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
+                                           cipher_data[i].flags
+                                           | EVP_CIPH_CUSTOM_COPY
++                                          | EVP_CIPH_CTRL_INIT
+                                           | EVP_CIPH_FLAG_DEFAULT_ASN1)
+             || !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
+             || !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
+@@ -594,11 +617,8 @@ static int digest_cleanup(EVP_MD_CTX *ct
+ 
+     if (digest_ctx == NULL)
+         return 1;
+-    if (ioctl(cfd, CIOCFSESSION, &digest_ctx->sess.ses) < 0) {
+-        SYSerr(SYS_F_IOCTL, errno);
+-        return 0;
+-    }
+-    return 1;
++
++    return clean_devcrypto_session(&digest_ctx->sess);
+ }
+ 
+ static int devcrypto_test_digest(size_t digest_data_index)