This patch adds an extra checks in ext4_mb_mark_bb() function
to make sure we mark & report error if we were to mark/clear any
of the critical FS metadata specific bitmaps (&bail out) to prevent
from any accidental corruption.
Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx>
---
fs/ext4/mballoc.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 5f20e355d08c..c94888534caa 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3920,6 +3920,13 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
len -= overflow;
}
+ if (!ext4_group_block_valid(sb, group, block, len)) {
+ ext4_error(sb, "Marking blocks in system zone - "
+ "Block = %llu, len = %d", block, len);
+ bitmap_bh = NULL;
+ goto out_err;
+ }
+
clen = EXT4_NUM_B2C(sbi, len);
bitmap_bh = ext4_read_block_bitmap(sb, group);
--
2.31.1
