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| author | Ritesh Harjani <riteshh@linux.ibm.com> | 2022-02-16 12:32:51 +0530 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-02-25 21:34:56 -0500 |
| commit | 8c91c57907d3ad8f88a12097213bb0920eb453b8 (patch) | |
| tree | 55a4ac7e62b1291fa4c5be898fb1172973be35ba | |
| parent | a00b482b82fb098956a5bed22bd7873e56f152f1 (diff) | |
| download | linux-8c91c57907d3ad8f88a12097213bb0920eb453b8.tar.bz2 | |
ext4: add extra check in ext4_mb_mark_bb() to prevent against possible corruption
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.
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/53cbb6f2573db162a57f935365050d8b1df202ee.1644992610.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/mballoc.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 0a95bdb1e07b..5f0bc6d0aabe 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3918,6 +3918,14 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block, EXT4_BLOCKS_PER_GROUP(sb) - EXT4_C2B(sbi, blkoff)); clen = EXT4_NUM_B2C(sbi, thisgrp_len); + if (!ext4_sb_block_valid(sb, NULL, block, thisgrp_len)) { + ext4_error(sb, "Marking blocks in system zone - " + "Block = %llu, len = %u", + block, thisgrp_len); + bitmap_bh = NULL; + break; + } + bitmap_bh = ext4_read_block_bitmap(sb, group); if (IS_ERR(bitmap_bh)) { err = PTR_ERR(bitmap_bh); |