[CRYPTO] cryptomgr: Fix parsing of nested templates

This patch allows the use of nested templates by allowing the use of
brackets inside a template parameter.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 25 insertions, 13 deletions

diff --git a/crypto/cryptomgr.c b/crypto/cryptomgr.c
index 7a3df9b41218..6958ea83ee44 100644
--- a/crypto/cryptomgr.c
+++ b/crypto/cryptomgr.c
@@ -14,17 +14,17 @@
 #include <linux/ctype.h>
 #include <linux/err.h>
 #include <linux/init.h>
+#include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/notifier.h>
 #include <linux/rtnetlink.h>
 #include <linux/sched.h>
 #include <linux/string.h>
-#include <linux/workqueue.h>
 
 #include "internal.h"
 
 struct cryptomgr_param {
-        struct work_struct work;
+        struct task_struct *thread;
 
         struct rtattr *tb[CRYPTOA_MAX];
 
@@ -45,10 +45,9 @@ struct cryptomgr_param {
         char template[CRYPTO_MAX_ALG_NAME];
 };
 
-static void cryptomgr_probe(struct work_struct *work)
+static int cryptomgr_probe(void *data)
 {
-        struct cryptomgr_param *param =
-                container_of(work, struct cryptomgr_param, work);
+        struct cryptomgr_param *param = data;
         struct crypto_template *tmpl;
         struct crypto_instance *inst;
         int err;
@@ -72,7 +71,7 @@ static void cryptomgr_probe(struct work_struct *work)
 
 out:
         kfree(param);
-        return;
+        module_put_and_exit(0);
 
 err:
         crypto_larval_error(param->larval.name, param->type.data.type,
@@ -87,9 +86,12 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
         const char *p;
         unsigned int len;
 
+        if (!try_module_get(THIS_MODULE))
+                goto err;
+
         param = kzalloc(sizeof(*param), GFP_KERNEL);
         if (!param)
-                goto err;
+                goto err_put_module;
 
         for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
                 ;
@@ -101,11 +103,18 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
         memcpy(param->template, name, len);
 
         name = p + 1;
-        for (p = name; isalnum(*p) || *p == '-' || *p == '_'; p++)
-                ;
+        len = 0;
+        for (p = name; *p; p++) {
+                for (; isalnum(*p) || *p == '-' || *p == '_' || *p == '('; p++)
+                        ;
 
-        len = p - name;
-        if (!len || *p != ')' || p[1])
+                if (*p != ')')
+                        goto err_free_param;
+
+                len = p - name;
+        }
+
+        if (!len || name[len + 1])
                 goto err_free_param;
 
         param->type.attr.rta_len = sizeof(param->type);
@@ -121,13 +130,16 @@ static int cryptomgr_schedule_probe(struct crypto_larval *larval)
 
         memcpy(param->larval.name, larval->alg.cra_name, CRYPTO_MAX_ALG_NAME);
 
-        INIT_WORK(&param->work, cryptomgr_probe);
-        schedule_work(&param->work);
+        param->thread = kthread_run(cryptomgr_probe, param, "cryptomgr");
+        if (IS_ERR(param->thread))
+                goto err_free_param;
 
         return NOTIFY_STOP;
 
 err_free_param:
         kfree(param);
+err_put_module:
+        module_put(THIS_MODULE);
 err:
         return NOTIFY_OK;
 }