Patch "block: refine the EOF check in blkdev_iomap_begin" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    block: refine the EOF check in blkdev_iomap_begin

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     block-refine-the-eof-check-in-blkdev_iomap_begin.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 3b61b08a4ea76aeb9d5626a079089ed24f643ce6
Author: Christoph Hellwig <hch@xxxxxx>
Date:   Fri May 3 10:10:42 2024 +0200

    block: refine the EOF check in blkdev_iomap_begin
    
    [ Upstream commit 0c12028aec837f5a002009bbf68d179d506510e8 ]
    
    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.
    
    Fixes: 487c607df790 ("block: use iomap for writes to block devices")
    Reported-by: syzbot+0a3683a0a6fecf909244@xxxxxxxxxxxxxxxxxxxxxxxxx
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Tested-by: syzbot+0a3683a0a6fecf909244@xxxxxxxxxxxxxxxxxxxxxxxxx
    Link: https://lore.kernel.org/r/20240503081042.2078062-1-hch@xxxxxx
    Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/block/fops.c b/block/fops.c
index 73e42742543f6..1df187b306792 100644
--- a/block/fops.c
+++ b/block/fops.c
@@ -387,7 +387,7 @@ 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;




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