[PATCH] f2fs: add sanity check for quota sysfile ino

[Chao Yu]

Add missing sanity check for quota sysfile ino.

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 fs/f2fs/super.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 368f63d7bad2..6011071688ca 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2116,6 +2116,25 @@ static int sanity_check_raw_super(struct f2fs_sb_info 
*sbi,
                return 1;
        }
 
+       /* check quota sysfile ino info */
+       if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_QUOTA_INO)) {
+               if (le32_to_cpu(raw_super->qf_ino[0]) != 4 ||
+                       le32_to_cpu(raw_super->qf_ino[1]) != 5) {
+                       f2fs_msg(sb, KERN_INFO,
+                               "Invalid Quota Ino: user_ino(%u), grp_ino(%u)",
+                               le32_to_cpu(raw_super->qf_ino[0]),
+                               le32_to_cpu(raw_super->qf_ino[1]));
+                       return 1;
+               }
+               if (raw_super->feature & cpu_to_le32(F2FS_FEATURE_PRJQUOTA) &&
+                       le32_to_cpu(raw_super->qf_ino[2]) != 6) {
+                       f2fs_msg(sb, KERN_INFO,
+                               "Invalid Quota Ino: prj_ino(%u)",
+                               le32_to_cpu(raw_super->qf_ino[2]));
+                       return 1;
+               }
+       }
+
        if (le32_to_cpu(raw_super->segment_count) > F2FS_MAX_SEGMENT) {
                f2fs_msg(sb, KERN_INFO,
                        "Invalid segment count (%u)",
-- 
2.15.0.55.gc2ece9dc4de6