mainline inclusion from mainline-v6.9-rc3 commit 22d24a544b0d49bbcbd61c8c0eaf77d3c9297155 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I9K0H3
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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There is no check for overflow of 'start + len' in blk_ioctl_discard(). Hung task occurs if submit an discard ioctl with the following param: start = 0x80000000000ff000, len = 0x8000000000fff000; Add the overflow validation now.
Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20240329012319.2034550-1-linan666@huaweicloud.com Signed-off-by: Jens Axboe axboe@kernel.dk Conflicts: block/ioctl.c [ Mainline commit 946e99373037 ("block/ioctl: use bdev_nr_sectors and bdev_nr_bytes") changed the way to get device size, keep use bdev_nr_bytes() in 5.10. Mainline commit 7607c44c157d ("block: Hold invalidate_lock in BLKDISCARD ioctl") changed context ] Signed-off-by: Li Nan linan122@huawei.com --- block/ioctl.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/block/ioctl.c b/block/ioctl.c index c8945df2e283..746d3fdf3cb7 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -101,7 +101,7 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, unsigned long arg, unsigned long flags) { uint64_t range[2]; - uint64_t start, len; + uint64_t start, len, end; struct request_queue *q = bdev_get_queue(bdev); int err;
@@ -122,7 +122,8 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, if (len & 511) return -EINVAL;
- if (start + len > i_size_read(bdev->bd_inode)) + if (check_add_overflow(start, len, &end) || + end > i_size_read(bdev->bd_inode)) return -EINVAL;
err = truncate_bdev_range(bdev, mode, start, start + len - 1);