--- a/linux-info.eclass	2011-12-13 02:01:37.000000000 +0400
+++ b/linux-info.eclass	2012-06-25 13:53:55.259008862 +0400
@@ -237,7 +237,7 @@
 # It returns true if .config exists in a build directory otherwise false
 linux_config_src_exists() {
 	export _LINUX_CONFIG_EXISTS_DONE=1
-	[ -s "${KV_OUT_DIR}/.config" ]
+	[ -n "${KV_OUT_DIR}" -a -f "${KV_OUT_DIR}/.config" ]
 }
 
 # @FUNCTION: linux_config_bin_exists
@@ -246,7 +246,7 @@
 # It returns true if .config exists in /proc, otherwise false
 linux_config_bin_exists() {
 	export _LINUX_CONFIG_EXISTS_DONE=1
-	[ -s "/proc/config.gz" ]
+	[ -f "/proc/config.gz" ]
 }
 
 # @FUNCTION: linux_config_exists