This is a note to let you know that I've just added the patch titled block: Add a helper to validate the block size to the 5.14-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-add-a-helper-to-validate-the-block-size.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 570b1cac477643cbf01a45fa5d018430a1fddbce Mon Sep 17 00:00:00 2001 From: Xie Yongji <xieyongji@xxxxxxxxxxxxx> Date: Tue, 26 Oct 2021 22:40:12 +0800 Subject: block: Add a helper to validate the block size From: Xie Yongji <xieyongji@xxxxxxxxxxxxx> commit 570b1cac477643cbf01a45fa5d018430a1fddbce upstream. There are some duplicated codes to validate the block size in block drivers. This limitation actually comes from block layer, so this patch tries to add a new block layer helper for that. Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20211026144015.188-2-xieyongji@xxxxxxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- include/linux/blkdev.h | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -240,6 +240,14 @@ struct request { void *end_io_data; }; +static inline int blk_validate_block_size(unsigned int bsize) +{ + if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize)) + return -EINVAL; + + return 0; +} + static inline bool blk_op_is_passthrough(unsigned int op) { op &= REQ_OP_MASK; Patches currently in stable-queue which might be from xieyongji@xxxxxxxxxxxxx are queue-5.14/loop-use-blk_validate_block_size-to-validate-block-size.patch queue-5.14/block-add-a-helper-to-validate-the-block-size.patch