libudev: do not accept invalid log levels

Invalid log levels lead to a assert failure later on.

https://bugs.freedesktop.org/show_bug.cgi?id=85657

diff --git a/src/libudev/libudev-util.c b/src/libudev/libudev-util.c
index f3fdf3b5aa7843fd91789ab732ec370002f1150f..0bc10f3470ac39783ad46d0f8d7fb5dd988f3835 100644 (file)
--- a/src/libudev/libudev-util.c
+++ b/src/libudev/libudev-util.c
@@ -159,9 +159,13 @@ int util_log_priority(const char *priority)
         char *endptr;
         int prio;
 
-        prio = strtol(priority, &endptr, 10);
-        if (endptr[0] == '\0' || isspace(endptr[0]))
-                return prio;
+        prio = strtoul(priority, &endptr, 10);
+        if (endptr[0] == '\0' || isspace(endptr[0])) {
+                if (prio >= 0 && prio <= 7)
+                        return prio;
+                else
+                        return -ERANGE;
+        }
 
         return log_level_from_string(priority);
 }

diff --git a/src/libudev/libudev.c b/src/libudev/libudev.c
index 7803863b2e946d00951487bc4e36684b0b35b868..846442765175186a6f1610e6df59ed298a6c9e4c 100644 (file)
--- a/src/libudev/libudev.c
+++ b/src/libudev/libudev.c
@@ -193,7 +193,13 @@ _public_ struct udev *udev_new(void)
                         }
 
                         if (streq(key, "udev_log")) {
-                                udev_set_log_priority(udev, util_log_priority(val));
+                                int prio;
+
+                                prio = util_log_priority(val);
+                                if (prio < 0)
+                                        udev_err(udev, "/etc/udev/udev.conf:%u: invalid logging level '%s', ignoring.\n", line_nr, val);
+                                else
+                                        udev_set_log_priority(udev, prio);
                                 continue;
                         }
                 }
@@ -201,8 +207,15 @@ _public_ struct udev *udev_new(void)
 
         /* environment overrides config */
         env = secure_getenv("UDEV_LOG");
-        if (env != NULL)
-                udev_set_log_priority(udev, util_log_priority(env));
+        if (env != NULL) {
+                int prio;
+
+                prio = util_log_priority(env);
+                if (prio < 0)
+                        udev_err(udev, "$UDEV_LOG specifies invalid logging level '%s', ignoring.\n", env);
+                else
+                        udev_set_log_priority(udev, prio);
+        }
 
         return udev;
 }