From 5875772e4c5154790e27700a3a25327d5c5c9aa5 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 3 May 2024 07:48:42 +0200 Subject: [PATCH] block: refine the EOF check in blkdev_iomap_begin blkdev_iomap_begin rounds down the offset to the logical block size before stashing it in iomap->offset and checking that it still is inside the inode size. Check the i_size check to the raw pos value so that we don't try a zero size write if iter->pos is unaligned. Signed-off-by: Christoph Hellwig --- block/fops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/fops.c b/block/fops.c index 679d9b752fe8..df2c68d3f198 100644 --- a/block/fops.c +++ b/block/fops.c @@ -390,7 +390,7 @@ static int blkdev_iomap_begin(struct inode *inode, loff_t offset, loff_t length, iomap->bdev = bdev; iomap->offset = ALIGN_DOWN(offset, bdev_logical_block_size(bdev)); - if (iomap->offset >= isize) + if (offset >= isize) return -EIO; iomap->type = IOMAP_MAPPED; iomap->addr = iomap->offset; -- 2.50.1