[PATCH v2 3/6] lib/support: check whether inump is null before, accessing it in quota_set_sb_inum()

[zhanchengbin <zhanchengbin1@xxxxxxxxxx>]

In quota_set_sb_inum(), we should check whether inump is null before 
accessing it,
otherwise the null potinter dereference error may occur.

Signed-off-by: zhanchengbin <zhanchengbin1@xxxxxxxxxx>
---
 lib/support/mkquota.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/support/mkquota.c b/lib/support/mkquota.c
index 6f4a0b90..482e3d91 100644
--- a/lib/support/mkquota.c
+++ b/lib/support/mkquota.c
@@ -99,7 +99,8 @@ void quota_set_sb_inum(ext2_filsys fs, ext2_ino_t ino, 
enum quota_type qtype)

 	log_debug("setting quota ino in superblock: ino=%u, type=%d", ino,
 		 qtype);
-	*inump = ino;
+	if (inump != NULL)
+		*inump = ino;
 	ext2fs_mark_super_dirty(fs);
 }

--
2.27.0