kmodloader: fix open() error handling

Fixes kmodloader on systems without stdio and prevents fd leaks in case
descriptor zero is opened.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

diff --git a/kmodloader.c b/kmodloader.c
index 387678ada91ffef3c9ba9bdf5f62a915bc72e6a7..86e3f447c4096b7101ddb640f775e9eb3e8ca89c 100644 (file)
--- a/kmodloader.c
+++ b/kmodloader.c
@@ -281,7 +281,7 @@ static struct module* get_module_info(const char *module, const char *name)
        struct module *m;
        struct stat s;
 
-       if (!fd) {
+       if (fd < 0) {
                ULOG_ERR("failed to open %s\n", module);
                return NULL;
        }
@@ -381,7 +381,7 @@ static int print_modinfo(char *module)
        struct stat s;
        char *map, *strings;
 
-       if (!fd) {
+       if (fd < 0) {
                ULOG_ERR("failed to open %s\n", module);
                return -1;
        }
@@ -466,7 +466,7 @@ static int insert_module(char *path, const char *options)
        }
 
        fd = open(path, O_RDONLY);
-       if (!fd) {
+       if (fd < 0) {
                ULOG_ERR("cannot open %s\n", path);
                return ret;
        }