diff options
| author | Helen Koike <koike@igalia.com> | 2026-03-17 11:23:10 -0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2026-03-27 23:36:11 -0400 |
| commit | 3822743dc20386d9897e999dbb990befa3a5b3f8 (patch) | |
| tree | 2e1c8ecf3a414ec8a877346978d494533667b5d4 | |
| parent | 9e1b14320b154094bb2c1bee6d8c6cb851fc3215 (diff) | |
ext4: reject mount if bigalloc with s_first_data_block != 0
bigalloc with s_first_data_block != 0 is not supported, reject mounting
it.
Signed-off-by: Helen Koike <koike@igalia.com>
Suggested-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: syzbot+b73703b873a33d8eb8f6@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b73703b873a33d8eb8f6
Link: https://patch.msgid.link/20260317142325.135074-1-koike@igalia.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
| -rw-r--r-- | fs/ext4/super.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 43f680c750ae..152c58fe8e01 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3633,6 +3633,13 @@ int ext4_feature_set_ok(struct super_block *sb, int readonly) "extents feature\n"); return 0; } + if (ext4_has_feature_bigalloc(sb) && + le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block)) { + ext4_msg(sb, KERN_WARNING, + "bad geometry: bigalloc file system with non-zero " + "first_data_block\n"); + return 0; + } #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2) if (!readonly && (ext4_has_feature_quota(sb) || |