Better checks for malloc failure in various METHOD functions

A number of the METHOD functions weren't properly handling malloc failures.

Reviewed-by: Richard Levitte <levitte@openssl.org>

crypto/dh/dh_meth.c

@@ -16,6 +16,10 @@ DH_METHOD *DH_meth_new(const char *name, int flags)
 
     if (dhm != NULL) {
         dhm->name = OPENSSL_strdup(name);
+        if (dhm->name == NULL) {
+            OPENSSL_free(dhm);
+            return NULL;
+        }
         dhm->flags = flags;
     }
 
@@ -40,6 +44,10 @@ DH_METHOD *DH_meth_dup(const DH_METHOD *dhm)
     if (ret != NULL) {
         memcpy(ret, dhm, sizeof(*dhm));
         ret->name = OPENSSL_strdup(dhm->name);
+        if (ret->name == NULL) {
+            OPENSSL_free(ret);
+            return NULL;
+        }
     }
 
     return ret;
@@ -52,10 +60,16 @@ const char *DH_meth_get0_name(const DH_METHOD *dhm)
 
 int DH_meth_set1_name(DH_METHOD *dhm, const char *name)
 {
-    OPENSSL_free(dhm->name);
-    dhm->name = OPENSSL_strdup(name);
+    char *tmpname;
 
-    return dhm->name != NULL;
+    tmpname = OPENSSL_strdup(name);
+    if (tmpname == NULL)
+        return 0;
+
+    OPENSSL_free(dhm->name);
+    dhm->name = tmpname;
+
+    return 1;
 }
 
 int DH_meth_get_flags(DH_METHOD *dhm)

crypto/dsa/dsa_meth.c

@@ -24,6 +24,10 @@ DSA_METHOD *DSA_meth_new(const char *name, int flags)
 
     if (dsam != NULL) {
         dsam->name = OPENSSL_strdup(name);
+        if (dsam->name == NULL) {
+            OPENSSL_free(dsam);
+            return NULL;
+        }
         dsam->flags = flags;
     }
 
@@ -48,6 +52,10 @@ DSA_METHOD *DSA_meth_dup(const DSA_METHOD *dsam)
     if (ret != NULL) {
         memcpy(ret, dsam, sizeof(*dsam));
         ret->name = OPENSSL_strdup(dsam->name);
+        if (ret->name == NULL) {
+            OPENSSL_free(ret);
+            return NULL;
+        }
     }
 
     return ret;
@@ -60,10 +68,16 @@ const char *DSA_meth_get0_name(const DSA_METHOD *dsam)
 
 int DSA_meth_set1_name(DSA_METHOD *dsam, const char *name)
 {
-    OPENSSL_free(dsam->name);
-    dsam->name = OPENSSL_strdup(name);
+    char *tmpname;
 
-    return dsam->name != NULL;
+    tmpname = OPENSSL_strdup(name);
+    if (tmpname == NULL)
+        return 0;
+
+    OPENSSL_free(dsam->name);
+    dsam->name = tmpname;
+
+    return 1;
 }
 
 int DSA_meth_get_flags(DSA_METHOD *dsam)

crypto/rsa/rsa_meth.c

@@ -16,6 +16,10 @@ RSA_METHOD *RSA_meth_new(const char *name, int flags)
 
     if (meth != NULL) {
         meth->name = OPENSSL_strdup(name);
+        if (meth->name == NULL) {
+            OPENSSL_free(meth);
+            return NULL;
+        }
         meth->flags = flags;
     }
 
@@ -40,6 +44,10 @@ RSA_METHOD *RSA_meth_dup(const RSA_METHOD *meth)
     if (ret != NULL) {
         memcpy(ret, meth, sizeof(*meth));
         ret->name = OPENSSL_strdup(meth->name);
+        if (ret->name == NULL) {
+            OPENSSL_free(ret);
+            return NULL;
+        }
     }
 
     return ret;
@@ -52,10 +60,16 @@ const char *RSA_meth_get0_name(const RSA_METHOD *meth)
 
 int RSA_meth_set1_name(RSA_METHOD *meth, const char *name)
 {
-    OPENSSL_free(meth->name);
-    meth->name = OPENSSL_strdup(name);
+    char *tmpname;
 
-    return meth->name != NULL;
+    tmpname = OPENSSL_strdup(name);
+    if (tmpname == NULL)
+        return 0;
+
+    OPENSSL_free(meth->name);
+    meth->name = tmpname;
+
+    return 1;
 }
 
 int RSA_meth_get_flags(RSA_METHOD *meth)

crypto/ui/ui_lib.c

@@ -536,8 +536,13 @@ UI_METHOD *UI_create_method(char *name)
 {
     UI_METHOD *ui_method = OPENSSL_zalloc(sizeof(*ui_method));
 
-    if (ui_method != NULL)
+    if (ui_method != NULL) {
         ui_method->name = OPENSSL_strdup(name);
+        if (ui_method->name == NULL) {
+            OPENSSL_free(ui_method);
+            return NULL;
+        }
+    }
     return ui_method;
 }