[PATCH v3] erofs-utils: lib: fix fd leak in erofs_metamgr_init()

[Deepak Pathik <deepakpathik2005@gmail.com>]

In erofs_metamgr_init(), erofs_tmpfile() returns a file
descriptor stored in m2gr->vf.fd. If the subsequent
erofs_buffer_init() call fails, the function returns -ENOMEM
without closing this file descriptor.

The caller erofs_metadata_init() handles this failure at
err_free, which only frees the m2gr struct. The fd is
therefore leaked with no remaining reference to close it.

The success path correctly cleans up via erofs_metamgr_exit(),
which calls erofs_io_close(&m2gr->vf). Mirror that behaviour
on the error path by closing the fd before returning.

Signed-off-by: Deepak Pathik <deepakpathik2005@gmail.com>
---
 lib/metabox.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/metabox.c b/lib/metabox.c
index d5ce9e3..86a7083 100644
--- a/lib/metabox.c
+++ b/lib/metabox.c
@@ -32,8 +32,10 @@ static int erofs_metamgr_init(struct erofs_sb_info *sbi,
 
 	m2gr->vf = (struct erofs_vfile){ .fd = ret };
 	m2gr->bmgr = erofs_buffer_init(sbi, 0, &m2gr->vf);
-	if (!m2gr->bmgr)
+	if (!m2gr->bmgr) {
+		erofs_io_close(&m2gr->vf);
 		return -ENOMEM;
+	}
 	return 0;
 }
 
-- 
2.53.0