修改4g拨号为QMI,需要在系统里后台执行quectel-CM

hc

2024-10-22 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5

 kernel/fs/udf/balloc.c
..
..
@@ -36,18 +36,41 @@
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 			     unsigned long bitmap_nr)
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 {
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 	struct buffer_head *bh = NULL;
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-	int retval = 0;
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+	int i;
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+	int max_bits, off, count;
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 	struct kernel_lb_addr loc;
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 	loc.logicalBlockNum = bitmap->s_extPosition;
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 	loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
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 	bh = udf_tread(sb, udf_get_lb_pblock(sb, &loc, block));
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-	if (!bh)
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-		retval = -EIO;
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-
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 	bitmap->s_block_bitmap[bitmap_nr] = bh;
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-	return retval;
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+	if (!bh)
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+		return -EIO;
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+
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+	/* Check consistency of Space Bitmap buffer. */
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+	max_bits = sb->s_blocksize * 8;
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+	if (!bitmap_nr) {
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+		off = sizeof(struct spaceBitmapDesc) << 3;
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+		count = min(max_bits - off, bitmap->s_nr_groups);
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+	} else {
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+		/*
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+		 * Rough check if bitmap number is too big to have any bitmap
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+		 * blocks reserved.
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+		 */
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+		if (bitmap_nr >
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+		    (bitmap->s_nr_groups >> (sb->s_blocksize_bits + 3)) + 2)
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+			return 0;
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+		off = 0;
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+		count = bitmap->s_nr_groups - bitmap_nr * max_bits +
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+				(sizeof(struct spaceBitmapDesc) << 3);
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+		count = min(count, max_bits);
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+	}
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+
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+	for (i = 0; i < count; i++)
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+		if (udf_test_bit(i + off, bh->b_data))
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+			return -EFSCORRUPTED;
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+	return 0;
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 }
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 static int __load_block_bitmap(struct super_block *sb,