From 2b4b2482e70eba10dd98653a3a5ac68126565e24 Mon Sep 17 00:00:00 2001 From: Bob Liu Date: Mon, 27 Jun 2011 16:18:06 -0700 Subject: romfs: fix romfs_get_unmapped_area() argument check romfs_get_unmapped_area() checks argument `len' without considering PAGE_ALIGN which will cause do_mmap_pgoff() return -EINVAL error after commit f67d9b1576c ("nommu: add page_align to mmap"). Fix the check by changing it in same way ramfs_nommu_get_unmapped_area() was changed in ramfs/file-nommu.c. Signed-off-by: Bob Liu Cc: David Howells Cc: Paul Mundt Acked-by: Greg Ungerer Cc: Geert Uytterhoeven Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/romfs/mmap-nommu.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/romfs/mmap-nommu.c b/fs/romfs/mmap-nommu.c index f0511e8..eed9942 100644 --- a/fs/romfs/mmap-nommu.c +++ b/fs/romfs/mmap-nommu.c @@ -27,14 +27,18 @@ static unsigned long romfs_get_unmapped_area(struct file *file, { struct inode *inode = file->f_mapping->host; struct mtd_info *mtd = inode->i_sb->s_mtd; - unsigned long isize, offset; + unsigned long isize, offset, maxpages, lpages; if (!mtd) goto cant_map_directly; + /* the mapping mustn't extend beyond the EOF */ + lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; isize = i_size_read(inode); offset = pgoff << PAGE_SHIFT; - if (offset > isize || len > isize || offset > isize - len) + + maxpages = (isize + PAGE_SIZE - 1) >> PAGE_SHIFT; + if ((pgoff >= maxpages) || (maxpages - pgoff < lpages)) return (unsigned long) -EINVAL; /* we need to call down to the MTD layer to do the actual mapping */ -- cgit v1.1