This is a note to let you know that I've just added the patch titled block/compat_ioctl: fix range check in BLKGETSIZE to the 4.9-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-compat_ioctl-fix-range-check-in-blkgetsize.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ccf16413e520164eb718cf8b22a30438da80ff23 Mon Sep 17 00:00:00 2001 From: Khazhismel Kumykov <khazhy@xxxxxxxxxx> Date: Thu, 14 Apr 2022 15:40:56 -0700 Subject: block/compat_ioctl: fix range check in BLKGETSIZE From: Khazhismel Kumykov <khazhy@xxxxxxxxxx> commit ccf16413e520164eb718cf8b22a30438da80ff23 upstream. kernel ulong and compat_ulong_t may not be same width. Use type directly to eliminate mismatches. This would result in truncation rather than EFBIG for 32bit mode for large disks. Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx> Signed-off-by: Khazhismel Kumykov <khazhy@xxxxxxxxxx> Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> Link: https://lore.kernel.org/r/20220414224056.2875681-1-khazhy@xxxxxxxxxx Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- block/compat_ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/block/compat_ioctl.c +++ b/block/compat_ioctl.c @@ -394,7 +394,7 @@ long compat_blkdev_ioctl(struct file *fi return 0; case BLKGETSIZE: size = i_size_read(bdev->bd_inode); - if ((size >> 9) > ~0UL) + if ((size >> 9) > ~(compat_ulong_t)0) return -EFBIG; return compat_put_ulong(arg, size >> 9); Patches currently in stable-queue which might be from khazhy@xxxxxxxxxx are queue-4.9/block-compat_ioctl-fix-range-check-in-blkgetsize.patch