From b07d0f2a85097e0fd0993abd969ecd967829ca1d Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 26 Feb 2019 12:55:40 +0900
Subject: [PATCH] sd-device: split device_read_db_internal() into two part

The new device_read_db_internal_filename() will be used by a fuzzer.
---
 src/libsystemd/sd-device/device-private.h |  1 +
 src/libsystemd/sd-device/sd-device.c      | 44 +++++++++++++----------
 2 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/src/libsystemd/sd-device/device-private.h b/src/libsystemd/sd-device/device-private.h
index 062bfd651c..49e02db81e 100644
--- a/src/libsystemd/sd-device/device-private.h
+++ b/src/libsystemd/sd-device/device-private.h
@@ -50,6 +50,7 @@ int device_new_from_synthetic_event(sd_device **new_device, const char *syspath,
 int device_tag_index(sd_device *dev, sd_device *dev_old, bool add);
 int device_update_db(sd_device *device);
 int device_delete_db(sd_device *device);
+int device_read_db_internal_filename(sd_device *device, const char *filename); /* For fuzzer */
 int device_read_db_internal(sd_device *device, bool force);
 static inline int device_read_db(sd_device *device) {
         return device_read_db_internal(device, false);
diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index 9137a93794..584e7def8a 100644
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -1273,13 +1273,11 @@ int device_get_id_filename(sd_device *device, const char **ret) {
         return 0;
 }
 
-int device_read_db_internal(sd_device *device, bool force) {
+int device_read_db_internal_filename(sd_device *device, const char *filename) {
         _cleanup_free_ char *db = NULL;
-        char *path;
-        const char *id, *value;
+        const char *value;
+        size_t db_len, i;
         char key;
-        size_t db_len;
-        unsigned i;
         int r;
 
         enum {
@@ -1291,22 +1289,14 @@ int device_read_db_internal(sd_device *device, bool force) {
         } state = PRE_KEY;
 
         assert(device);
+        assert(filename);
 
-        if (device->db_loaded || (!force && device->sealed))
-                return 0;
-
-        r = device_get_id_filename(device, &id);
-        if (r < 0)
-                return r;
-
-        path = strjoina("/run/udev/data/", id);
-
-        r = read_full_file(path, &db, &db_len);
+        r = read_full_file(filename, &db, &db_len);
         if (r < 0) {
                 if (r == -ENOENT)
                         return 0;
-                else
-                        return log_device_debug_errno(device, r, "sd-device: Failed to read db '%s': %m", path);
+
+                return log_device_debug_errno(device, r, "sd-device: Failed to read db '%s': %m", filename);
         }
 
         /* devices with a database entry are initialized */
@@ -1359,13 +1349,31 @@ int device_read_db_internal(sd_device *device, bool force) {
 
                         break;
                 default:
-                        assert_not_reached("Invalid state when parsing db");
+                        return log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL), "sd-device: invalid db syntax.");
                 }
         }
 
         return 0;
 }
 
+int device_read_db_internal(sd_device *device, bool force) {
+        const char *id, *path;
+        int r;
+
+        assert(device);
+
+        if (device->db_loaded || (!force && device->sealed))
+                return 0;
+
+        r = device_get_id_filename(device, &id);
+        if (r < 0)
+                return r;
+
+        path = strjoina("/run/udev/data/", id);
+
+        return device_read_db_internal_filename(device, path);
+}
+
 _public_ int sd_device_get_is_initialized(sd_device *device) {
         int r;