ext4: don't try to modify s_flags if the the file system is read-only

If an ext4 file system is created by some tool other than mke2fs
(perhaps by someone who has a pathalogical fear of the GPL) that
doesn't set one or the other of the EXT2_FLAGS_{UN}SIGNED_HASH flags,
and that file system is then mounted read-only, don't try to modify
the s_flags field.  Otherwise, if dm_verity is in use, the superblock
will change, causing an dm_verity failure.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 1f7784d..710fed2 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3695,16 +3695,22 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
        for (i = 0; i < 4; i++)
                sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
        sbi->s_def_hash_version = es->s_def_hash_version;
-       i = le32_to_cpu(es->s_flags);
-       if (i & EXT2_FLAGS_UNSIGNED_HASH)
-               sbi->s_hash_unsigned = 3;
-       else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
+       if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
+               i = le32_to_cpu(es->s_flags);
+               if (i & EXT2_FLAGS_UNSIGNED_HASH)
+                       sbi->s_hash_unsigned = 3;
+               else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
 #ifdef __CHAR_UNSIGNED__
-               es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
-               sbi->s_hash_unsigned = 3;
+                       if (!(sb->s_flags & MS_RDONLY))
+                               es->s_flags |=
+                                       cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
+                       sbi->s_hash_unsigned = 3;
 #else
-               es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
+                       if (!(sb->s_flags & MS_RDONLY))
+                               es->s_flags |=
+                                       cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
 #endif
+               }
        }
 
        /* Handle clustersize */