[PATCH] module: fix a memory leak

When a module is removed and re-inserted without unrefing, the
kmod_file is unconditionally re-opened. This results in a memory
and file descriptor leak.

Fix it by checking if the file is already open in
kmod_module_insert_module().

Signed-off-by: Bartosz Golaszewski <redacted>
---
 libkmod/libkmod-module.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/libkmod/libkmod-module.c b/libkmod/libkmod-module.c
index bf6a8d6..57da0a2 100644
--- a/libkmod/libkmod-module.c
+++ b/libkmod/libkmod-module.c

@@ -833,10 +833,12 @@ KMOD_EXPORT int kmod_module_insert_module(struct kmod_module *mod,
                return -ENOENT;
        }

-       mod->file = kmod_file_open(mod->ctx, path);
-       if (mod->file == NULL) {
-               err = -errno;
-               return err;
+       if (!mod->file) {
+               mod->file = kmod_file_open(mod->ctx, path);
+               if (mod->file == NULL) {
+                       err = -errno;
+                       return err;
+               }
        }

        if (kmod_file_get_direct(mod->file)) {
--