If S_ISREG swapfile's blocksize > PAGE_SIZE, it is not suitable to be a swapfile, because swap slot is fixed to PAGE_SIZE. This patch check this situation and return -EINVAL if it happens. Signed-off-by: Weijie Yang <weijie.yang@xxxxxxxxxxx> --- mm/page_io.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/page_io.c b/mm/page_io.c index 7247be6..3d9bd12 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -150,6 +150,8 @@ int generic_swapfile_activate(struct swap_info_struct *sis, int ret; blkbits = inode->i_blkbits; + if(blkbits > PAGE_SHIFT) + return -EINVAL; blocks_per_page = PAGE_SIZE >> blkbits; /* -- 1.7.10.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>