diff --git a/fs/erofs/decompressor_lzma.c b/fs/erofs/decompressor_lzma.c
index 6b0cdb446c6a..9d15f94cbee1 100644
--- a/fs/erofs/decompressor_lzma.c
+++ b/fs/erofs/decompressor_lzma.c
@@ -5,6 +5,7 @@
 struct z_erofs_lzma {
 	struct z_erofs_lzma *next;
 	struct xz_dec_microlzma *state;
+	unsigned int dict_size;
 	u8 bounce[PAGE_SIZE];
 };
 
@@ -128,11 +129,19 @@ static int z_erofs_load_lzma_config(struct super_block *sb,
 	err = 0;
 	/* 2. walk each isolated stream and grow max dict_size if needed */
 	for (strm = head; strm; strm = strm->next) {
+		struct xz_dec_microlzma *state;
+
+		if (strm->dict_size >= dict_size)
+			continue;
+		state = xz_dec_microlzma_alloc(XZ_PREALLOC, dict_size);
+		if (!state) {
+			err = -ENOMEM;
+			break;
+		}
 		if (strm->state)
 			xz_dec_microlzma_end(strm->state);
-		strm->state = xz_dec_microlzma_alloc(XZ_PREALLOC, dict_size);
-		if (!strm->state)
-			err = -ENOMEM;
+		strm->state = state;
+		strm->dict_size = dict_size;
 	}
 
 	/* 3. push back all to the global list and update max dict_size */
@@ -142,7 +151,8 @@ static int z_erofs_load_lzma_config(struct super_block *sb,
 	spin_unlock(&z_erofs_lzma_lock);
 	wake_up_all(&z_erofs_lzma_wq);
 
-	z_erofs_lzma_max_dictsize = dict_size;
+	if (!err)
+		z_erofs_lzma_max_dictsize = dict_size;
 	mutex_unlock(&lzma_resize_mutex);
 	return err;
 }