1 files changed, 26 insertions, 12 deletions

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 35d700a97d79..dfd511fb39ee 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -30,6 +30,8 @@
 
 #include "internal.h"
 
+#define null_terminated(x)      (strnlen(x, sizeof(x)) < sizeof(x))
+
 static DEFINE_MUTEX(crypto_cfg_mutex);
 
 /* The crypto netlink socket */
@@ -75,7 +77,7 @@ static int crypto_report_cipher(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_cipher rcipher;
 
-        snprintf(rcipher.type, CRYPTO_MAX_ALG_NAME, "%s", "cipher");
+        strncpy(rcipher.type, "cipher", sizeof(rcipher.type));
 
         rcipher.blocksize = alg->cra_blocksize;
         rcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
@@ -94,8 +96,7 @@ static int crypto_report_comp(struct sk_buff *skb, struct crypto_alg *alg)
 {
         struct crypto_report_comp rcomp;
 
-        snprintf(rcomp.type, CRYPTO_MAX_ALG_NAME, "%s", "compression");
-
+        strncpy(rcomp.type, "compression", sizeof(rcomp.type));
         if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
                     sizeof(struct crypto_report_comp), &rcomp))
                 goto nla_put_failure;
@@ -108,12 +109,14 @@ nla_put_failure:
 static int crypto_report_one(struct crypto_alg *alg,
                              struct crypto_user_alg *ualg, struct sk_buff *skb)
 {
-        memcpy(&ualg->cru_name, &alg->cra_name, sizeof(ualg->cru_name));
-        memcpy(&ualg->cru_driver_name, &alg->cra_driver_name,
-               sizeof(ualg->cru_driver_name));
-        memcpy(&ualg->cru_module_name, module_name(alg->cra_module),
-               CRYPTO_MAX_ALG_NAME);
-
+        strncpy(ualg->cru_name, alg->cra_name, sizeof(ualg->cru_name));
+        strncpy(ualg->cru_driver_name, alg->cra_driver_name,
+                sizeof(ualg->cru_driver_name));
+        strncpy(ualg->cru_module_name, module_name(alg->cra_module),
+                sizeof(ualg->cru_module_name));
+
+        ualg->cru_type = 0;
+        ualg->cru_mask = 0;
         ualg->cru_flags = alg->cra_flags;
         ualg->cru_refcnt = atomic_read(&alg->cra_refcnt);
 
@@ -122,8 +125,7 @@ static int crypto_report_one(struct crypto_alg *alg,
         if (alg->cra_flags & CRYPTO_ALG_LARVAL) {
                 struct crypto_report_larval rl;
 
-                snprintf(rl.type, CRYPTO_MAX_ALG_NAME, "%s", "larval");
-
+                strncpy(rl.type, "larval", sizeof(rl.type));
                 if (nla_put(skb, CRYPTOCFGA_REPORT_LARVAL,
                             sizeof(struct crypto_report_larval), &rl))
                         goto nla_put_failure;
@@ -196,7 +198,10 @@ static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
         struct crypto_dump_info info;
         int err;
 
-        if (!p->cru_driver_name)
+        if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
+                return -EINVAL;
+
+        if (!p->cru_driver_name[0])
                 return -EINVAL;
 
         alg = crypto_alg_match(p, 1);
@@ -260,6 +265,9 @@ static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
         LIST_HEAD(list);
 
+        if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
+                return -EINVAL;
+
         if (priority && !strlen(p->cru_driver_name))
                 return -EINVAL;
 
@@ -287,6 +295,9 @@ static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct crypto_alg *alg;
         struct crypto_user_alg *p = nlmsg_data(nlh);
 
+        if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
+                return -EINVAL;
+
         alg = crypto_alg_match(p, 1);
         if (!alg)
                 return -ENOENT;
@@ -368,6 +379,9 @@ static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
         struct crypto_user_alg *p = nlmsg_data(nlh);
         struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
 
+        if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
+                return -EINVAL;
+
         if (strlen(p->cru_driver_name))
                 exact = 1;