Re: BUG: unable to handle kernel NULL pointer dereference in generic_perform_write (2)

["Theodore Y. Ts'o" <tytso@xxxxxxx>]

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5b8b9d0c6d0e0f1993c6c56deaf9646942c49d94

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9728e7b0e84f..e44fee317965 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1728,6 +1728,7 @@ static int clear_qf_name(struct super_block *sb, int qtype)
 #define MOPT_NO_EXT3	0x0200
 #define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
 #define MOPT_STRING	0x0400
+#define MOPT_NO_REMOUNT 0x0800
 
 static const struct mount_opts {
 	int	token;
@@ -1777,7 +1778,7 @@ static const struct mount_opts {
 	{Opt_min_batch_time, 0, MOPT_GTE0},
 	{Opt_inode_readahead_blks, 0, MOPT_GTE0},
 	{Opt_init_itable, 0, MOPT_GTE0},
-	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
+	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET | MOPT_NO_REMOUNT},
 	{Opt_stripe, 0, MOPT_GTE0},
 	{Opt_resuid, 0, MOPT_GTE0},
 	{Opt_resgid, 0, MOPT_GTE0},
@@ -1819,7 +1820,7 @@ static const struct mount_opts {
 	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
 	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
 	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
-	{Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
+	{Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET | MOPT_NO_REMOUNT},
 	{Opt_err, 0, 0}
 };
 
@@ -1917,6 +1918,12 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
 			 "Mount option \"%s\" incompatible with ext3", opt);
 		return -1;
 	}
+	if ((m->flags & MOPT_NO_REMOUNT) && is_remount) {
+		ext4_msg(sb, KERN_ERR,
+			 "Mount option \"%s\" not supported when remounting",
+			 opt);
+		return -1;
+	}
 
 	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
 		return -1;
@@ -5429,18 +5436,6 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 		}
 	}
 
-	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
-		ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
-		err = -EINVAL;
-		goto restore_opts;
-	}
-
-	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
-		ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
-			"dax flag with busy inodes while remounting");
-		sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
-	}
-
 	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
 		ext4_abort(sb, EXT4_ERR_ESHUTDOWN, "Abort forced by user");