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
---
 fs/ext4/super.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 495f99c10085..9f0cc29b718f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3626,6 +3626,13 @@ 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) ||
-- 
2.53.0

On Tue, 17 Mar 2026 11:23:10 -0300, Helen Koike wrote:
> bigalloc with s_first_data_block != 0 is not supported, reject mounting
> it.

Applied, thanks!

[1/1] ext4: reject mount if bigalloc with s_first_data_block != 0
      commit: 3822743dc20386d9897e999dbb990befa3a5b3f8

Best regards,
-- 
Theodore Ts'o <tytso@mit.edu>